Chemistry QuestionsHydrogen And Its Compounds Questions for CBSE Class 11th

Hydrogen And Its Compounds Questions for CBSE Class 11th

Which one is not a isotope of hydrogen ?

The pair that yields the same gaseous product on reaction with water

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    A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly

    The property of Hydrogen which resembles that of halogens is

    Hydrogen is a unique element in the periodic table.Some statements about isotopes of hydrogen and hydrides are given below.False statement among them is

    Correct set among the following A) Mg(HCO 3 ) 2 + 2Ca(OH) 2 → 2CaCO 3 + Mg(OH) 2 + 2H 2 O : Clark’s method B) M +2 + Na 4 P 6 O 18 2– → [Na 2 MP 6 O 18 ] 2– + 2Na + : Calgon’s method C) 2NaZ + M +2 → MZ 2 + 2Na + : Ion exchange method D) 2RNa + M +2 → R 2 M + 2Na + : Synthetic resin method

    Alkali metal hydrides react with water to give

    20 volumes H 2 O 2 solution has a strength of about

    Which of the following groups of ions makes the water hard ?

    The volume strength of 1.5 N H 2 O 2 solution is

    Identify the correct statement from the following.

    Correct order of boiling point is

    Which of the following hydrogen compounds is most ionic ?

    In all its properties, hydrogen resembles

    Pick out the correct statement

    Plumbosolvency is a health hazard in the transportation of

    Under what condition of temperature and pressure the formation of atomic hydrogen from molecular hydrogen will be favoured most ?

    Which of the following is/are correct statement(s)? (I) Hydrogen is the first and the unique element in the periodic table. (II) Electronic configuration of H-atom is 1s 1 . (III) Hydrogen gas has diatomic molecules.

    Which of the following is incorrect for hydrogen?

    Which of the following is not an isotope of hydrogen?

    The principal element in the atmospheres of Sun and the giant planets Jupiter and Saturn is :

    The half life period of H 1 3 is

    The number of neutrons present in the nuclei of H 1 1 , H 1 2 and H 1 3 respectively are

    For simplicity, sodium aluminium silicate is written as

    Column-I (Nature of hydride) Column-II (Groups of periodic table) (p) Electron precise (i) Be, Mg and group 13 (q) Electron rich (ii) Groups 15,16,17 (r) Electron deficient (iii) Group 14

    Heavy water is used as a

    For obtaining 100% pure H 2 O 2 , the last traces of water are removed by

    What are the organic compounds ‘X’ and ‘Y’ in the following reactions, respectively? (I) CaC 2 + D 2 O ‘X’ + Ca(OD) 2 (II) Al 4 C 3 + D 2 O ‘Y’ + Al(OD) 3

    Observe the following reactions and select the correct option (I) HCI + D 2 O DCI + HOD (II) NaOH + D 2 O NaOD + HDO

    H 2 gas was used with LPG for running four wheelers for the first time in the year

    In which of the following respect, electronic configuration of hydrogen has resemblance to alkali metals and halogens respectively?

    Which of the following statements about hydrogen is incorrect?

    Column-I (Hydride) Column-II (Nature) (I) CrH (A) Metallic hydride (II) HF (B) Molecular hydride (III) NaH (C) Saline hydride Correct match is

    Hardness of water can be temporary or permanent. Wrong Match about removal of hardness of water among the following is

    Molarity of perhydrol is

    Solubility of a salt depends on lattice enthalpy and hydration enthalpy. Least soluble salt in water among the following is

    The number of hydrogen bonded water molecule(s) associated with CuSO 4 . 5 H 2 O is

    Na 2 CO 3 + H 2 O 2     Na 2 O 2 + H 2 O + CO 2 . In this reaction H 2 O 2 behaves like

    Hydrogen peroxide has some unique properties and structure. Regarding H 2 O 2 , correct statement is

    All the following can give hydrogen peroxide when they react with water except

    Freezing point of heavy water is

    Among the radioactive elements tritium is used as better tracer because

    Hydrogen gas is prepared in the laboratory by

    The correct statement about the following is

    Dihydrogen reduces CuO to

    Hydrogen is not obtained when zinc reacts with

    The ratio of densities of hydrogen, deuterium and tritium under similar conditions of temperature and pressure

    The property of hydrogen which distinguishes it from other alkali metals is

    The value of …….. is less for D 2 O compared to that of H 2 O.

    List – I(compound) List – II (form of water) 1) CuSO 4 .5H 2 O A) Hydrogen bonded water 2) BaCl 2 . 2H 2 O B) Interstitial water 3) CrCl 3 . 6H 2 O C) Coordinated water Correct match is

    The O–H bond energy in water when compared to O–D bond energy in heavy water is

    Different samples of water containing each 100 ppm of CaCl 2 , MgSO 4 , CaSO 4 and MgCl 2 among them which will have greater hardness

    Temporary hardness of water can be removed A) By Clark’s process B) By Boiling water

    Match the following List-1 List-II A) 50vol of H 2 O 2 1) 300 g/L of H 2 O 2 B) 1 vol of H 2 O 2 2) 44.8 vol of H 2 O 2 C) 30% (w/V) of H 2 O 2 3) 22.4 vol of H 2 O 2 D) 4 molar H 2 O 2 4) 4.46 molar of H 2 O 2 5) 0.303 g/100 ml of

    In which of the following reactions, H 2 O 2 acts as a reducing reagent ?

    The method of storing of H 2 O 2 is

    H 2 O 2 cannot act as

    The dipole moment of H 2 O 2 is 2.1D. This indicates the structure of H 2 O 2 is

    Excess of ozone when passed through 1 lit of 1M H 2 O 2 solution, the volume of oxygen liberated at STP will be…….

    Statement I: H 2 O 2 is a linear molecule. Statement II : Each oxygen atom in H 2 O 2 is sp hybridized.

    Statement I: The heat of vapourization of HF is higher than that of H 2 O Statement II : The hydrogen bond strength in HF is weaker than that of H 2 O

    Statement I: H 2 O 2 reduces Cl 2 to HCl Statement II : H 2 O 2 is also called antichlor

    The common name of sodium hexa meta phosphate (Na 6 P 6 O 18 ) is

    Permanent hardness of water arises due to the presence of

    (A) : Heavy water is used as moderator in nuclear reactors. (B) : Heavy water undergoes exchange reaction in nuclear reactor.

    Which of the following is not true

    Dihedral angle in gaseous hydrogen peroxide molecule is

    In H 2 O 2 molecule, the angle in gas phase is

    Negative catalyst for the decomposition of H 2 O 2 is

    H 2 O 2 → 2H + + O 2 + 2e – ; E 0 = – 0.68V. The above equation represents which of the following behaviour of H 2 O 2 ?

    In context with industrial preparation of hydrogen from water gas (CO + H 2 ) which of the following is the correct statement?

    Polyphosphates like calgon are used as water softening agents because they

    When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is

    The number of peroxy bonds present in the product formed when H 2 O 2 reacts with acidified potassium dichromate are

    Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is

    Which one of the following statements about a zeolite is false

    In solid ice, oxygen atom is surrounded

    Which of the following reactions requires high temperature and catalyst?

    The ionisation energy of hydrogen is

    The maximum number of possible hydrogen molecules formed from its isotopes is

    In naturally available hydrogen, the percentage of tritium is

    (solution) Terrestial hydrogen contains 0.0156% of deuterium mostly in the form of

    In which of the following hydride law of constant composition does not hold good.

    Statement I: Temporary hardness can be removed by boiling hard water Statement II : On boiling hard water bicarbonates of calcium and magnesium are converted to insoluble carbonates

    Statement I: Thermally hydrogen peoxide is unstable Statement II : The peroxy bond length in H 2 O 2 molecule is 1.48 A The correct answer is

    In the following reactions which is deuterolysis I) AlCl 3 + 3D 2 O → Al(OD) 3 + 3DCl II) CaC 2 + 2D 2 O → Ca(OD) 2 + C 2 D 2 III) Mg 3 P 2 + 6D 2 O → 3Mg(OD) 2 + 2PD 3

    An aqueous solution of H 2 O 2 is labeled as 33.6 vol. The amount of H 2 O 2 present in 50ml of such an aqueous solution is

    What is the volume strength of 200 ml of aqueous H 2 O 2 solution containing 6.8 gm of H 2 O 2

    Equivalent weight of H 2 O 2 as oxidizing agent is ……. and as a reducing agent is …….

    The hydride that is NOT electron deficient is

    Statement I: D 2 is more rapidly adsorbed on the surface than H 2 . Statement II : Vander Waal’s forces of attraction are more in D 2 than in H 2

    In heavy water molecule

    Angle between two OH groups of solid hydrogen peroxide is

    In the reaction, H 2 S + H 2 O 2 → S + 2H 2 O

    The following reacts with water to give H 2 O 2

    The number of hydrogen-boded and coordinated water molecule present in hydrated copper sulphate salt are respectively

    Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H 2 O 2 . The number of peroxy (O–O) bonds present in X and Y respectively are :

    Statement I: H 2 O 2 is stored in wax – lined glass Statement II : Presence of metal surfaces, traces of alkali (present in glass) etc increases its decomposition

    When PbS is oxidised by H 2 O 2 the increase in oxidation state of sulphur is

    Which of the following pairs will not produce dihydrogen gas ?

    Which element forms maximum compound in chemistry ?

    One of the following is an incorrect statement. Point out the incorect one.

    Hydrogen is

    The composition of tritium is

    Hydrogen has three isotopes, the number of possible diatomic molecules will be

    Hydrogen does not combine with

    Among CaH 2 , NH 3 , NaH and B 2 H 6 , which are covalent hydrides ?

    Polyphosphates are used as water softening agents because

    Temporary hardness may be removed from water by adding

    Deuterium differs from hydrogen in

    D 2 O is preferred to H 2 O , as a moderator, in nuclear reactors because

    Hydrogen can behave as a metal

    Hardness of water is due to presence of salts of

    The oxidation states exhibited by hydrogen in its various compuonds are

    At its melting point ice is lighter than water because

    Saline hydrides react explosively with water, such fires can be extinguished by

    Decomposition of H 2 O 2 is accelerated by

    Which statement about zeolite is false ?

    H 2 O 2 is manufactured these days

    The hydrogen ion, H – , is a stronger base than the hydroxide ion, OH – Which one of the following reactions will occur if sodium hydride (NaH) is dissolved in water ?

    Alkali metals react with cold water and alkaline earth metals with boiling water to displace

    The terrestrial hydrogen contains 0.0156% of deuterium, mostly in the form of

    H 1 3 or β – emitter which of the following is the correct nuclear disintegration reaction for H 1 3

    What name is given to approximate 1 : 1 mixture of CO and H 2 gases?

    Supply the missing term in the reaction Zn + . ….. Na 2 ZnO 2 + H 2

    Which of the following is incorrect for H 2 , D 2 and T 2 ?

    Which of the following gas is much lighter than air, highly combustible, insoluble in water, colourless, odourless and tasteless?

    Approximately 77% of industrial dihydrogen is produced from

    In bulk of water and in ice one water molecule forms …………. hydrogen bonds.

    Which of the following is not a redox reaction?

    Which of the following is correct for H 2 O 2 ?

    The number of H 2 O molecules coordinated and hydrogen bonded in CuSO 4 .5H 2 O, respectively are

    After the exhaust of zeolite in ion-exchange method, it is regenerated by using

    Which of the following shows oxidising nature of H 2 O 2 ?

    Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is

    Which of the following compounds is used for water softening?

    Statement-I: Permanent hardness of water is removed by treatment with washing soda. Statement-II: Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.

    Permanent hardness of water can be removed by adding

    The dihedral angle in gaseous H 2 O 2 is

    Oxidation state of hydrogen is negative in

    Correct statements among the following are A) Hydrogen is a better fuel than petrol B) H 2 O 2 bleaches by reduction C) Formula of permutit is Na 2 [ Na 4 ( PO 3 ) 6 ] D) H-H bond length is equal to D-D bond length

    Statement I ; The reagent used in Clarke’s process of removal of hardness of water is sodium carbonate Statement II ; Deionized water is potable

    CH 4 g + H 2 O g 1273   K Ni X ; ‘X’ is

    Regarding Hydrogen peroxide, false statement is

    LiH , NaH , KH , BeH 2 , CaH 2 . How many are predominantly covalent

    (I) H 2 O 2 + O 3 ⟶ H 2 O + 2 O 2 (II) H 2 O 2 + Ag 2 O ⟶ 2 Ag + H 2 O + O 2 Role of hydrogen peroxide in the above reactions is respectively

    The reaction of aqueous K M n O 4 with H 2 O 2 in acidic conditions gives

    A process is non-spontaneous at all temperatures when

    The method used to remove temporary hardness of water is

    Which of the following can act like a negative catalyst in the decmposition of Hydrogen peroxide

    Number of hydrogen bonded water molecules in blue vitriol

    Hydrogen peroxide can act like an oxidant or a reductant. H 2 O 2 acts like reducing agent in its reaction with

    Match the following and identify the correct option. (a) CO ( g ) + H 2 ( g ) (i) Mg ( HCO 3 ) 2 + Ca ( HCO 3 ) 2 (b) Temporary hardness of water (ii) An electron deficient hydride (c) B 2 H 6 (iii) Synthesis gas (d) H 2 O 2 (iv) Non-planar

    MnO 4 −   H + H 2 O 2   A   OH − H 2 O 2   B .   In this process, B and A respectively are

    Maximum number of H-bonds formed by a water molecule is/are

    In Clarke’s process, the salts responsible for hardness get precipitated as

    Correct statement among the following is

    Interstitial water molecules are present in

    20 volume H 2 O 2 is not equal to

    1% H 2 O 2 obtained is extracted with water. The steps involved in its concentration are given below. I) Evaporation under reduced pressure II) Distillation under reduced pressure III) Freezing The proper sequence of above steps is

    Structure of hydrogen peroxide molecule is

    Statement 1:Heavy water is used as a moderator in nuclear reactor. Statement 2 : Moderator is a light substance that absorb neutrons.

    False statements among the following are A) Tritium is a β – emitter B) Terrestrial Deuterium exists as HD C) Protium contains one neutron D) Deuterium and Tritium are radioactive

    Molarity of 90 volume hydrogen peroxide solution is

    Decomposition of hydrogen peroxide can be accelerated by

    The high density of water compared to ice is due to

    The O-H bond length in H 2 O is xAº. The O-H bond length in H 2 O 2 is

    Hydrogen has similarity with alkali metals in

    The element which has no suitable position in the periodic table is

    Hydrogen mainly resembles alkali metals in the property

    Statement I : Both H 2 and D 2 have same internuclear distance Statement II : Enthalpy of bond dissociation is same for H 2 and D 2

    Hydrogen mainly resembles halogens in the property

    Incorrect statement among the following is

    The total number of fundamental particles in normal hydrogen molecule

    The radioactive isotope of hydrogen is

    , and will have the same , and differ in their

    Most abundant element in the universe is

    Ionisation potential of hydrogen is

    Bond length is more in

    In which of the following conversion iron chromate catalyst is used.

    Syngas contains

    The reaction which does not liberate hydrogen is

    Number of types of hydrides known is

    Electrolysis of molten saline hydride generally gives

    Which one of the following reactions does not correspond to the preparation of “Synthetic gasoline” during the Fischer-Tropsch process ?

    H 2(g) + Cl 2(g) → 2HCl (g) …… rate = r 1 D 2(g) + Cl 2(g) → 2DCl (g) ….. rate = r 2 . The value of r 1 > r 2 . Then the correct statement among the following is

    Hydrogen will not reduce heated

    Purest form of hydrogen is obtained by

    The reaction involved during the removal of temporary hardness of water is

    Deionised water is prepared by the following method

    Percentage of water present in oceans

    Statement I: Solubility of NaCl is more in D 2 O than in water Statement II : Molecular weight of D 2 O is more than that of water

    Deutero methane is obtained by the deuterolysis of

    The reagent(s) used for softening the temporary hardness of water are a) Ca 3 (PO 4 ) 2 b) Ca(OH) 2 c) Na 2 CO 3 d) NaOCl

    The correct statement regarding structure of ice. A) Ice has a highly ordered three dimensional hydrogen bonded structure. B) Each oxygen atom in ice is surrounded tetrahedrally by four other oxygen atoms at a distance of 276 pm. C) Hydrogen bonding gives ice a open structure with wide holed. These holes can hold some other molecules of approapriate size interstitially.

    In which of the following reactions, H 2 O 2 acts as oxidising agent ?

    The weight of H 2 O 2 present in 10 ml 80Vol. H 2 O 2 solution is

    When 20 ml of 2.5M H 2 O 2 aqueous soultion is decomposed the S.T.P. volume of oxygen obtained is

    The volume of 40 vol. H 2 O 2 solution required to prepare 2L. of O 2 at STP is

    The oxidation states of the most electronegative element in the products of the reaction of BaO 2 with dil.H 2 SO 4 are

    The substance which can not be used for preparing H 2 O 2 solution is

    Which of the following statements is incorrect ?

    H 2 O 2 turns blackened lead paintings to white colour. In this reaction it oxidises PbS to PbSO 4 . The number of moles of H 2 O 2 needed to oxidise one mole of PbS is.

    During decomposition of H 2 O 2 , it undergoes

    Hydrogen forms a stoichiometric hydride with which of the following metal

    Volume strength of perhydrol is

    The following reaction shows the reducing action of H 2 O 2

    Only one element of forms hydride

    Consider the reactions : A) H 2 O 2 + 2HI I 2 + 2H 2 O B) HOCl + H 2 O H 3 O+ + Cl – + O 2 Which of the following statements is correct about H 2 O 2 with reference to these reactions? Hydrogen peroxide is

    5.0 cm 3 of H 2 O 2 liberates 0.508 g of iodine from an acidified KI solution. The strength of H 2 O 2 solution in terms of volume strength at STP is

    Hydrogen resembles alkali metals in many aspects but differs in

    The reaction between H 2 O 2 and KMnO 4 is 2KMnO 4 + 3H 2 SO 4 + 5H 2 O 2 → K 2 SO 4 + 2MnSO 4 + 8H 2 O + 5O 2 .If 30 ml H 2 O 2 is required to reduce 15 ml 0.02 M KMnO 4 solution, the molarity of H 2 O 2 is

    30 lit of oxygen is liberated at STP by the complete decomposition of a sample of 1 lit of H 2 O 2 . The molarity of that H 2 O 2 solution is nearly

    Which one of the following reactions represents the oxidizing property of H 2 O 2 ?

    The quantity of charge liberated during the formation of 3.6 grams of water in hydrogen fuel cell is

    6.8 gm of H 2 O 2 is present in 500 ml of an aqueous solution. When 10ml of this solution is decomposed, what is the S.T.P. volume of oxygen obtained

    Statement-I: Calorofic value of hydrogen is more than that of petrol Statement-II: Heat of combustion of hydrogen is less than that of petrol

    The approximate mass of H 2 O 2 present in 200mL of 100 volume H 2 O 2 solution is

    Statement I: The boiling point of H 2 O 2 cannot be determined experimentally by distillation. Statement II: H 2 O 2 decomposes into H 2 and O 2 below its boiling point.

    Statement I: Hydrogen reacts faster with halogens than deuterium. Statement II : The activation energy of hydrogen is less than that of deuterium.

    Statement I: Hydrogen has only two isotopes namely protium and deuterium Statement II : Protium is radioactive in nature

    Statement I: NaCl is less soluble in heavy water than in ordinary water. Statement II : Dielectric constant of ordinary water is more than that of heavy water.

    I) CuSO 4 + 5H 2 O → CuSO 4 . 5H 2 O II) PCl 3 + 3H 2 O → H 3 PO 3 + 3HCl. The processes I and II are respectively

    Statement I: Saline hydrides are non volatile, non conducting and crystalline solids Statement II : Saline hydrides are compounds of hydrogen with most of the p – block elements

    Statement I: Hard water does not give lather with soap Statement II : In hard water, the sodium stearate of soap changes to the corresponding calcium magnesium salt which precipitates out

    Statement I: Phosphours cannot form PH 5 Statement II : High ΔH a value of dihydrogen and ΔH eg value of hydrogen do not favour to exhibit the highest oxidation state of ‘P’.

    How many hydrogen bonded water molecules are associated with FeSO 4 .7H 2 O ?

    H 2 O + H 2 O H 3 O + + OH – . In this reaction water acts as I ) Bronsted Acid II) Bronsted Base III) Amphoteric oxide

    Which of the following reactions increases production of dihydrogen from synthesis gas?

    Temporary hardness is due to

    In Clark's method, the substance used for the removal of temporary hardness of water is

    The molecular formula of a commerical resin used for exchanging ions in water softening is C 8 H 7 SO 3 Na (Mol. wt. 206) What would be the maximum uptake of Ca +2 ions by the resin when expressed in mole per gram resin?

    The group responsible for the removal of cations in ion exchange resin is

    If excess of Ca(OH) 2 is added to hard water in Clark's method

    Exhausted cation exchange resin is regenerated by using solution of moderately concentrated

    Which of the following methods does not remove hardness of water ?

    The nature of water sample coming out through cation exchanger is

    Hardness of water is due to the presence of

    In atomic reactor heavy water is used as

    The physical constant which is less for water than for heavy water is A) Dielectric constant B) Ionic product

    The compound formed when heavy water reacts with CaC 2 is

    Boiling point of heavy water is

    The pH of D 2 O and H 2 O at 298K is

    Volume strength of 10%(w/v) H 2 O 2 is approximately

    An antiseptic sold in the market

    Hydrolysis of one mole of peroxodisulphuric acid produces

    Delicate materials like silk, wool and ivory are bleached by

    H 2 O 2 + Na 2 CO 3 → Na 2 O 2 + H 2 O + CO 2 . In this reaction H 2 O 2 acts like

    Which one of the following reactions does not form gaseous product ?

    In which reaction, hydrogen peroxide neither acts as an oxidising agent nor as a reducing agent ?

    The volume of oxygen liberated at STP by decomposition of one L hydrogen peroxide solution with a strength of 17g per litre ?

    Ortho and para hydrogen differ

    Match list-I with list-II. Choose the correct matching codes from the choices given List-I List-II A) AsH 3 1) Complex B) B 2 H 6 2) Lewis acid C) LaH 3 3) Interstitial D) LiAlH 4 4) Covalent

    A mixture of hydrazine and H 2 O 2 is used as

    For the decolorisation of one mole of KMnO 4 in acidic medium the number of moles of H 2 O 2 required is

    At room temperature the ratio of ortho and para hydrogens in dihydrogen is

    Fentons reagent among the following is

    In transforming 0.01mole of PbS to PbSO 4 the volume of ‘10volume’ H 2 O 2 required will be

    The number of moles of D 2 O required in the complete exchange reaction with one mole of NH 4 Cl are

    Which of the following disproportionates when treated with water ?

    In the calgon process of softening of water, which of the following is used?

    Non-stoichiometric hydrides are formed by

    Bond angles H-O-H and H-O-O- in water and H 2 O 2 in vapour state respectively are

    Maximum number of hydrogen bonds that one water molecule is capable of forming is

    The P H of a solution of H 2 O 2 is 6.0. Some Cl 2 gas is bubbled into this solution. Which of the following is correct ?

    Which of the following statement is false about hardness of water

    The property of heavy water which is lesser than water is

    All the following can liberate hydrogen with alkali except

    Regarding hydrogen peroxide correct statements are A) Its decomposition can be retarded by the addition of glycerol B) It is purified by vacuum distillation C) It is used as an antiseptic D) It oxidizes potassium permanganate in acidic medium whereas it reduces potassium permanganate in basic medium

    Hydrogen is not obtained when zinc reacts with

    Water cannot act as

    Ortho-hydrogen and para-hydrogne resemble in which of the following property

    Which of the following produces hydrolith with dihydrogen ?

    Hydrogen accepts an electron to form inert gas configuration. In this it resembles

    The property of hydrogen which distinguishes it from alkali metals is

    The sum of proton, electrons and neutrons in the lightest isotope of hydrogen is

    In context with the industrial preparation of hydrogen from water gas (CO + H2) which of the following is the correct statement ?

    The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is

    Hydrogen directly combines with

    Which of the following statements concerning protium, deuterium and tritium is not true ?

    Abundance of H 2 in the earth’s atmosphere is very small. This is because

    The ratio C p / C v for H 2 is

    Which of the following could act as a propellant for rockets ?

    Hydrogen acts as an oxidising agent in the reaction with

    Which of the following reaction produces hydrogen ?

    Hydrogen is evolved the action of cold dilute HNO 3 on

    In Bosch’s process, which gas is utilised for the production of hydrogen gas

    In which of the following compounds does hydrogen have an oxidation state of – 1 ?

    Which of the following explanation is best for not placing hydrogen with alkali metals or halogen

    Which position for hydrogen explain all its properties ?

    Hydrogen can be produced by heating

    Hydrogen combines with other elements by

    Ortho and para hydrogen have

    Hydrogen readily combines with non-metals and thus it shows its

    The metal which displace hydrogen from a boiling caustic soda soltuion is

    Metal hydride on treatment with water gives

    Free hydrogen is found in

    The radioactive isotopes of hydrogen is

    When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution the ratio of volumes of hydrogen evolved is

    Which of the following pairs of substances on reaction will not evolve H 2 gas ?

    Which of the following metals adsorbs hydrogen ?

    Hydrogen resembles in many of its properties

    Very pure hydrogen (99.9%) can be made by which of the following processes ?

    Which of the following hydrides is electron deficient ?

    When a substance A reacts with water, it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner: A, B, C and D respectively are

    Hydrogen from HCl can be prepared by

    Action of water or dilute mineral acids on metal can give

    Which pair does not show hydrogen isotopes ?

    Water gas is

    Which of the following has the highest proton affinity ?

    Ortho and para hydrogen differ in

    Hydrogen gas is not liberated when the following metal is added to dil. HCl

    Hydrogen acts as an oxidizing agent in its reaction with

    Out of the following metals which will give H 2 on reaction with NaOH I: Zn, II: Mg, III: Al, IV: Be

    Which of the following acid is formed when SiF 4 reacts with water ?

    Which of the following pairs of molecules have practically the same mass ?

    Action of water or dilute mineral acids on metals can give

    The critical temperature of water is higher than that of O 2 because H 2 O molecule has

    Deuteroammonia ND 3 can be prepared

    The bond angle and dipole moment of water respectively are

    Which is true statement about D 2 O and H 2 O ?

    Temporary hardness may be removed from water by adding

    Which of the following pair of ions makes the water hard ?

    Water contracts on heating

    Pure water can be obtained from sea water by

    What is false about ice ?

    Which will produce hard water ?

    Which one of the following reactions represents water-gas shift reaction ?

    The alum used for purifying water is

    A variety of water which contains soluble salts of Ca and Mg is known as

    Metal which does not react with cold water but evolves H 2 with steam is

    Temporary hardness of water is due to the presence of

    Which of the following is not true ?

    The reagent commonly used to determine hardness of water titrimetrically is

    Which of the following will cause softening of hard water ?

    Select the correct statement for heavy water.

    Which one of the following removes temporary hardness of water ?

    Which of the following is not true ?

    Which of the following is not a hard water ?

    Lead pipes are not used for carrying drinking water because

    Heavy water is used in nuclear reactors as

    Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO 2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A

    Water is said to be permanently hard when it contains

    The molarity of pure water at 4 0 C is

    When temporary hard water containing Mg HCO 3 2 is boiled, the ppt. formed is of

    Heavy water is a compound of

    Permanent hardness due to Mg 2 + ions is best removed by

    Which of the following is correct about heavy water ?

    Which of the following statements do not define the characeristics property of water “Water is a universal solvent”?

    Which of the following is used as a moderator in nuclear reactors ?

    Hardness producing salt, whose solubility in water decreases with rise of temperature is

    Molecular weight of heavy water is

    Of the two solvent H 2 O and D 2 O , NaCl dissolves

    On shaking H 2 O 2 with acidified potassium dichromate and ether, ethanal layer becomes

    The correct stability order of ionic hydride is

    When zeolite (Hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with

    The species that does not contain peroxide ion is

    Which of the following can effectively remove all types of hardness of water ?

    An oxide which gives H 2 O 2 on treatment with dilute acid is

    Which of the following metal will not reduce H 2 O ?

    Water obtained by purification with organic ion exchange resins is

    In which of the following reactions, H 2 O 2 acts as a reducing agent

    When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of

    H 2 O 2 is

    Point out the incorrect statement

    Nitrates of all metals are

    H 2 O 2 acts as an oxidising agent in

    The dihedral angle in gaseous H 2 O 2 is

    HCl is added to following oxides. Which one would give H 2 O 2 ?

    The dihedral angle in gaseous H 2 O 2 is

    H 2 O 2 used in rockets has the concentration

    Which substance cannot be reduced by H 2 O 2

    The volume of oxygen liberated from 0.68 g of H 2 O 2 is

    Which of the following statements about H 2 O 2 is not true ?

    The amount of H 2 O 2 present in 1 L of 1.5 N H 2 O 2 solution is

    Equivalent weight of H 2 O 2 as reductant is

    The H-O-O bond angle is H 2 O 2 is

    A dilute solution of H 2 O 2 is labelled as 20 volume. Its percentage strength is

    Which substance does not speed up decomposition of H 2 O 2 ?

    The decomposition of H 2 O 2 can be checked by the addition of

    A dilute solution of H 2 O 2 is labelled as 20 volume. Its percentage strength is

    H 2 O 2 is used as

    Hydrogen peroxide is now generally prepared on industrial scale by the

    H 2 O 2 ⇌ 2 H + + O 2 + 2 e – ; E 0 = – 0 . 68 V . This equation represents which of the following behaviour of H 2 O 2

    In lab H 2 O 2 is prepared by

    The volume of oxygen liberated from 15 ml of 20 volume H 2 O 2 is

    The reaction of H 2 S + H 2 O 2 S + 2 H 2 O manifests

    The oxide that gives hydrogen peroxide H 2 O 2 on the treatment with a dilute acid H 2 SO 4 is

    H 2 O 2 is always stored in black bottles because

    The structure of H 2 O 2 is

    There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength.

    In which of the following reaction hydrogen peroxide is a reducing agent

    Blackened oil painting can be restored into original form by the action of

    Commercial 11.2 volume H 2 O 2 solution has a molarity of

    Which of the following undergoes reduction with H 2 O 2 in an alkaline medium ?

    Statement 1 : H 2 molecule is more stable than He-H molecule. Statement 2 : The antibonding electron in He-H molecule decreases the bond order there by the stability.

    Statement 1 : H 2 exists in two isomeric forms known as ortho and para forms. Statement 2 : The ortho and para H 2 differ in the spin of their electron.

    Statement 1 : H 2 O 2 has higher boiling point than water Statement 2 : It has stronger dipole interactions than that shown by water.

    In the reaction, H 2 S + H 2 O 2 S + 2 H 2 O

    Statement 1 : The decomposition of H 2 O 2 is a disproportionation reaction. Statement 2 : 2H 2 O 2   2 H 2 O + O 2

    Statement 1 : H 2 gas is liberated at anode because. Statement 2 : Sodium hydride contains H – ion.

    Statement 1 : H 2 O 2 is non-ionic compound. Statement 2 : The O − O bond length in H 2 O 2 is shorter than that of O 2 F 2 .

    Statement 1 : H 2 O 2 is used as a bleaching agent for delicate materials like silk, wool, etc. Statement 2 : The bleaching action of H 2 O 2 is due to reduction.

    Statement 1 : Heavy water is widely used as a moderator in nuclear reactors. Statement 2 : It slows down the fast moving neutrons and thus helps in controlling the nuclear reactions.

    Statement 1 : Demineralised water does not contain any ions. Statement 2 : Permutit process for water softening gives demineralised water.

    Statement 1 : Reaction between protium and chlorine is much faster than between deuterium and chlorine. Statement 2 : Enthalpy of dissociation of D 2 is less than H 2 .

    Statement 1 : H 2 O 2 decomposes carbonates and bicarbonates to evolve CO 2 gas. Statement 2 : H 2 CO 3 is stronger acid than H 2 O 2 .

    Statement 1 : Ionic hydrides like hydrolith liberates hydrogen gas on reaction with water. Statement 2 : The resultant solution acts as strong base.

    Statement 1 : Calogen is used in manufacture of soft water being used for laundry purpose. Statement 2 : Ca 2 +    and   Mg 2 + ions present in hard water are rendered ineffectively by calgon forming their soluble complexes.

    Statement 1 : NH 3 is an electron precise hydride. Statement 2 : NH 3 has one lone pair of electrons on N atom.

    Statement 1 : The water gas shift reaction can be used to increase the amount of H 2 in the ‘syn gas’ mixture. Statement 2 : In this reaction, water is reduced to H 2 by CO.

    Statement 1 : Nascent hydrogen is more reactive than molecular hydrogen. Statement 2 : Nascent hydrogen is associated with more energy.

    Statement 1 : D 2 O has higher boiling point than H 2 O. Statement 2 : Viscosity of H 2 O l is less than that of D 2 O l .

    Statement 1 : Calgon is used for removing Ca 2 +    and   Mg 2 + ions from hard water. Statement 2 : Calgon forms soluble complexes with Ca 2 +     and   Mg 2 + in which properties of these ions are masked.

    Statement 1 : The alkali metals can form ionic hydrides which contains the hydride ion. Statement 2 : The alkali metals have low electronegativity, their hydrides conduct electricity when fused and liberate hydrogen at the anode.

    Statement 1 : Decomposition of H 2 O 2 is a disproportionation reaction. Statement 2 : H 2 O 2 molecule simultaneously undergoes oxidation and reduction.

    Statement 1 : Hydrogen peroxide forms only one series of salts called peroxides. Statement 2 : Hydrogen peroxide molecule has two replaceable hydrogen atom.

    Hydrogen is evolved by the action of cold dil. HNO 3 on

    Pick the odd one out

    Hydrogen will not reduce

    One mole of calcium phosphide on reaction with excess water gives

    Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy is

    Hydrogen can be fuse to form helium at

    A sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will be

    In the reaction, 2FeSO 4   +    H 2 SO 4    +    H 2 O 2      Fe 2 SO 4 3   +    2 H 2 O The oxidizing agent is

    H 2 O 2 can be obtained when following reacts with H 2 SO 4 except with

    In alkaline medium, H 2 O 2 reacts with Fe 3 + and Mn 2 + respectively to give

    H 2 O 2 H 2 O + O 2 This represents

    The O – O – H bond angle in H 2 O 2 is

    When H 2 O 2 is oxidised, the product is

    The dielectric constant of H 2 O is 80. The electrostatic force of attraction between Na + and Cl – will be

    Which of the following is correct for hydrogen ?

    which of the following elements has simplest atomic structure?

    Which of the following elements consists of atom with no neutron in the nucleus?

    Hydrogen resembles both alkali metals as well as halogens. Select the correct statement out of the following

    The most abundant element in the universe (about 70% of the total mass of the universe) is

    Hydrogen does not show metallic character because of

    Which of the following is the radioactive isotope of hydrogen?

    H 1 1 , H 1 2 and H 1 3 differ in number of

    The relative percentage abundance of H 1 1 , H 1 2 and H 1 3 , respectively is

    Which of the following are usually used for the preparation of H 2 gas in laboratory?

    What type of redox reaction is Zn + 2 H + Zn 2 + + H 2 ?

    H 2 gas can be prepared by reacting steam H 2 O g with

    H 2 gas is relatively inert at room temperature due to

    H 2 gas can be converted to H 1 s 1 atoms by

    A hydride is crystalline, stoichiometric, non-volatile and non-conducting in solid state. it is likely to be

    Covalent or molecular hydrides are classified in ……………. types.

    Which of the following is likely to form metallic or non-stoichiometric hydride?

    In which of the following the metal lattice and metal hydride lattice are considered to have nearly the same structure?

    Hydrides of which elements can form hydrogen bond between similar molecules?

    Very high adsorption of hydrogen on some metals like Pt, Ni, Pd, etc., is used for

    The percentage of water in human body and many plants is respectively

    The unusual properties of water in the condensed phase (liquid and solid) are due to:

    Which of LiH, BeH 2 , and MgH 2 have polymeric structure through hydrogen-bridge bond ?

    Which nature of H 2 O is shown by the following reactions respectively? I H 2 O + H 2 O ⇌ H 3 O + + OH – II NH 3 + H 2 O ⇌ NH 4 + + OH – III H 2 O + H 2 S ⇌ H 3 O + + HS −

    The number of H 2 O molecules directly joined with Ba 2+ in BaCl 2 2H 2 O is :

    Temporary hardness of water can be removed by

    The very first method of removing hardness of water used

    The empirical formula of permutit or zeolite used in ion-exchange method is

    Which of the following is the industrial method for the preparation of H 2 O 2 ?

    Which of the following is not correct for H 2 O 2 ?

    Which of the following is the correct method of preparation of D 2 O 2 in the laboratory ?

    One gram of which of the following releases the maximum energy?

    H 2 (g) releases about ……… times more energy on combustion than petrol (isooctane), per gram of fuel.

    For the storage of a small quantity of hydrogen, the tank is made from the alloy

    Hydrogen economy means use of H 2 (g) or H 2 (l) as fuel. The advantage of hydrogen economy is

    Column-I Column-II (p) [Cr(H 2 O)) 6 ] Cl 3 (i) Interstitial water (q) BaCl 2 · 2 H 2 O (ii) Coordinated as well as hydrogen bonded H 2 O (r) [Cu(H 2 O 4 )] 2+ SO 4 2 – · H 2 O (iii) Coordinated H 2 O

    Column-I Column-II (p) NH 3 (i) Ionic hydride (q) CaH 2 (ii) Electron precise molecular hydride (r) MaBH 4 (iii) Electron rich covalent hydride (s) CH 4 (iv) Binary hydride (v) Complex hydride

    Statement-I: H 2 O 2 is used to restore the white color of old oil paintings. Statement-II: H 2 O 2 oxidizes PbS of old oil paintings to PbSO 4 .

    Statement-I: Water gas may contain about 4% extra hydrogen than CO gas. Statement-II: Water gas is prepared by passing steam over red hot coke.

    Statement-I: I.E. of H-atom is comparable with halogen atoms. Statement-II: H-atom is much larger than alkali metals.

    Statement-I: Ionic hydrides are formed by alkali metals. Statement-II: Ionic hydrides conduct electricity in their fused state and liberate H 2 gas at anode.

    Statement-I: Hard water gives good foam with soap. Statement-II: Permanent Hard water contains one or more of bicarbonates, chlorides and sulphates of Ca 2+ /Mg 2+ .

    Statement-I: Temporary hardness of water is due to the presence of bicarbonates of Ca 2+ / Mg 2+ . Statement-II: Permanent hardness of water is due to the presence of chlorides/sulphates of Ca 2+ / Mg 2+ .

    Statement-I: Temporary hardness of water can be removed by boiling it. Statement-II: On heating bicarbonates of Ca 2+ and Mg 2+ decompose to give insoluble products.

    Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?

    Why does H + ion always get associated with other atoms or molecules?

    Which of the following hydrides is electron-precise hydride?

    Radioactive elements emit alpha,, beta and gamma rays and are characterised by their half-lives. The radioactive isotope of hydrogen is

    The oxide that gives H 2 O 2 on treatment with dilute H 2 SO 4 is

    Hydrogen peroxide is

    Which of the following reactions increases production of dihydrogen from synthesis gas?

    Hydrogen peroxide is obtained by the electrolysis of ……….

    Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

    Which of the following ions will cause hardness in water sample?

    Only one element of ………….. forms hydride.

    Elements of which of the following group(s) of periodic table do not form hydrides?

    Heavy water is

    Excess of NaOH reacts with Zn to form

    100 cm 3 of a given sample of H 2 O 2 , gives 1000 cm 3 of O 2 at STP. The given sample is

    In solid ice, oxygen atom is surrounded

    Water gas is

    When CO 2 is bubbled through a solution/suspension of barium peroxide in water

    A dilute solution of H 2 O 2 is labelled as 10 volume. Its strength in g L -1 is

    Permanent hardness of water can be removed by adding

    H 2 gas cannot reduce

    Hydrogen peroxide is………..

    When sodium peroxide is treated with dilute sulphuric acid, we get ……….

    Oxidation of 2-ethylanthraquinol produces H 2 O 2 and …………

    In context with industrial preparation of hydrogen from water gas (CO + H 2 ), which of the following is the correct statement?

    Strength of H 2 O 2 is labeled as 10 V. Its percentage strength is nearly

    Non-stoichiometric hydrides are formed by

    In industry H 2 O 2 is commonly prepared by

    Which of the following statements about hydrogen is incorrect ?

    At room temperature parahydrogen is

    Life time of atomic hydrogen is

    When H 2 O 2 is shaken with acidified solution of K 2 Cr 2 O 7 in the presence of ether, the etherial layer turns blue due to the formation of :

    The reagent not used for softening the temporary hardness of water is

    The molecular formula of a commercial resin used for exchanging ion in water softening is C 8 H 7 SO 3 Na (mol. wt. = 206). What would be the minimum uptake of Ca 2+ ions by the resin when expressed in mole per gram resin ?

    Ca OH 2    excess CO 2 A . Correct statement about ‘A’ is

    Which of the following is not correct about hydrogen peroxide

    What is produced when CH 4 reacts with steam at 1273 K in the presence of Ni?

    The dihedral angle in solid hydrogen peroxide molecule is nearly

    Which one of the following create great and high performance in a missile?

    Correct statements among the following are A) Tritium is a ß-emitter B) Pure hydrogen can be obtained by the electrolysis of Ba(OH) 2 solution using Nickel electrodes C) Hydrogen reduces Zn +2 (aq) D) Atomic hydrogen torch is used for welding purpose

    Volume strength and normality of perhydrol are respectively

    Which of the following conducts electricity at room temperature?

    Identify the correct statement

    Element (X) does not form Hydride when reacts with dihydrogen. Atomic number of element (X) is

    Density of H 2 O 2 and H 2 O are respectively d 1 and d 2 . Boiling point of H 2 O and H 2 O 2 are respectively T 1 K and T 2 K. Identify correct relation

    The number of proton and electron in atomic form of hydrogen respectively are

    Hydrogen does not possess the metallic character under normal conditions because

    How many neutrons are present in protium, deuterium and tritium respectively?

    Which of the following method is used to obtain high purity (> 99.95)% dihydrogen?

    Hydrogen is much less abundant in the earth’s atmosphere because of its

    Which of the following gas is/are obtained by electrolysis of acidified water using platinum electrodes?

    Which of the following explanation justifies for not placing hydrogen in either the group of alkali metals or halogens?

    O 2 − + H 2 O Predict the outcome of the reaction

    Which redox properties does H2O2 exhibit respectively, in given reactions? 2 Cr ( OH ) 3 + 4 NaOH + 3 H 2 O 2 2 Na 2 CrO 4 + 8 H 2 O 2 K 3 Fe ( CN ) 6 + 2 KOH + H 2 O 2 2 K 4 Fe ( CN ) 6 + 2 H 2 O + O 2

    In which of these does H 2 O 2 acts as oxidizing agent ?

    Hydrogen resembles halogens in all the following properties except

    Hydrogen peroxide is considered as parent of Peroxo compounds.Regarding Hydrogen peroxide, false statement is

    Volume strength of H 2 O 2 solution is 56 volume. Normality of this solution is equal to

    Statement I ; The reagent used in Clarke’s process of removal of hardness of water is sodium hydroxide Statement II ; Deionized water is not potable

    Which of the following is not correct about hydrogen peroxide

    The dihedral angle in gaseous hydrogen peroxide molecule is nearly

    Decomposition of hydrogen peroxide can be accelerated in presence of

    Formula of Calgon is

    Regarding hydrogen and its isotopes, incorrect statement is

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