In a reaction between A and B the initial rate of reaction(r 0 ) was measured for different initial concentrations of A and B as given below: Experiment number [A] mol /lit [B] mol /lit Rate of reaction (mole/lit/sec) I 0.20 0.30 5.07 × 10 -5 II 0.20 0.10 5.07 × 10 -5 III 0.40 0.05 1.014 × 10 -4 Identify incorrect statement(s) about the given reaction
Which nuclear reaction is an example of α -emission?
When a radioactive isotope decays into a nucleus, which is also unstable and undergoes decay and this process is repeated several times, the succession of reaction is called
At equilibrium, number of atoms disintegrating at two different stages are in the ratio of 1 : 10 . If half-Iife of first stage is 15 min, half-Iife second stage would be
Select the incorrect statement.
The maximum binding energy per nucleon is indicated in the mass number range
1 amu is equal to
The neutron/proton ratio in an isotope can be decreased by the emission of
The radiant energy from the sun is due to
The high temperature required to initiate nuclear fusion reaction is initially attained through
The 238 U 92 disintegrates to give 4a and 6b particles. The group number of the daughter element is
The half time of first order decomposition of nitramide is 2.1 hour at 15°C. NH 2 NO 2 ( aq . ) N 2 O ( g ) + H 2 O ( l ) If 6.2 g of N H 2 N O 2 is allowed to decompose, calculate time taken in hours for N H 2 N O 2 to decompose 99%. [ log 10 2 = 0.3 ]
The analysis of a mineral of uranium reveals that ratio of moles of 206 Pb and 238 U in sample is 0.2. If effective decay constant of process 238 U 206 P b is λ then age of rock is(assuming the only source of Pb in the mineral is U).
Which of the following plots is(are) correct for the given reaction? ([P] 0 is the initial concentration of P)
The nuclei of a certain radioactive element are produced at a constant rate of α per second. This element has a decay constant λ . Initially N 0 nuclei of the element are present. If in the above question α = 2 λ N 0 calculate the number of nuclei left in the element after one half life period of the element.
Emission of a beta particle by an atom of an element results in the formation of
The number of beta particles emitted in the radioactive decay series from 92 238 U to 82 206 Pb is
18 37 Ar captures a K-electron into its nucleus. The product atom formed is
Which nuclear reaction is not balanced?
In a radioactive series, a radioactive isotope decays to stable isotope. 90 232 Th decays by emission of six α and four β -particles. Stable isotope is
At two stages of disintegration, disintegration constants are respectively 1 × 10 − 2 s − 1 and 1 × 10 − 5 s − 1 . At first stage 2000 atoms are disintegrating. At second stage number of atoms disintegrating would be
The unstable nucleus 82 212 Pb decays with β -particle emission, having a half-life of 10 h. From this it follows that the A : mass number of the product is 212 B : atomic number of the product is 81 C : fraction of the original isotope remaining after 20 h is 1 4 D : product nucleus formed belongs to same group Select the correct alternate.
The nucleus of an atom is made up of P protons and N neutrons. For the most stable and abundant nuclei,
Nuclear fission was experimentally observed by
In which process maximum energy is attained ?
Which nuclear reaction is an example of fusion reaction?
Which reaction shows artificial transmutation by α -bombardment?
In the nuclear reaction : 13 27 Al + 2 4 He ⟶ X + n , X is
In vivo studies, radioisotope used is
Radioactivity can be used in
The rate of a reaction triple when temperature changes from 20°C to 50°C. Calculate energy of activation for the reaction. ( R = 8.314 J K − 1 m o l − 1 )
For a reaction 2 A A 2 , the rate of reaction becomes 8 times when the concentration of A changes from a to 2a . The order of reaction is
For a 1st order parallel reactions at 300K Then the overall energy of activation is
For the reaction : 2 A g 3 B g + C l , the rate law is r = − 1 2 . d P A d t = K . P A The reaction is performed at constant volume and temperature, starting with only pure A(g). If PT and P∞ are the total pressure of system at t = T min and t = ∞ and P0 is the vapour pressure of C l , t hen the rate constant of reaction may be expressed as
A small quantity of solution containing of 11 N a 24 radionuclide t 1 / 2 = 15 h r s of activity 1.0 μ C i is injected in to the blood of a person. A sample of the blood of volume 1 c m 3 taken after 5hour shows an activity of 296 dpm. Determine the total volume of the blood in the body of the person. Assume the radioactive solution mixes uniformly in the blood of the person 1.0 C i = 3.7 × 10 10 d p s (antilog of 0.1 ≃ 1.26 )
For a reaction A+B gives P, whose specific rate constant is K, a graph is plotted log K Vs 1 T . If the slope of curve obtained is -10 k.cal and intercept is 3 m i n – 1 . Then,
A first order chemical reaction. A ® P is occurring at 500 K. If the same reaction is to be carried out in presence of a catalyst, temperature of 400 K is required to be maintained in order to maintain the same rate of reaction. If the catalyst lowers the activation energy by 30 kJ, then what would be the value of activation energy of the original pathway (uncatalysed reaction)/25.
Which is/are correct graph for given reactions?
A green plant contains radioactive C 14 and C 12 isotope. If in a sample of dead old wood of this plant 2 . 5 × 10 – 6 mol 14 C and 7 . 5 × 10 – 6 mol 14 N are present then calculate value of Z. Assuming all ‘N’ is obtained due to disintegration of 14 C . Where Z = A g e o f w o o d t H a l f l i f e o f 14 C i s o t o p e t 1 / 2
The Maxwell-Boltzmann distribution curves below represent the kinetic energies of molecules at four different temperatures in a reaction with an activation energy, Ea, of 7 arbitrary units-used to study kinetics of this reaction at these four temperatures. Amount of the reactant is different at each temperature. Select the perfectly valid statement(s) useful in the study of kinetics of the reaction at different temperatures in terms of Arrhenius collision theory without considering Steric factor:
U 92 238 is known to undergo radioactive decay to form Pb 82 206 by emitting alpha and beta particles. A rock initially contained 68 × 10 –6 g of Pb 92 238 . If the number of alpha particles that it would emit during its radioactive decay of U 92 238 to Pb 82 206 in three half-lives is Z × 10 18 , then what is the value of Z ?
The count rate of a 10 ml radioactive liquid is C. Some of the liquid is now discarded. The count rate of the remaining liquid is found to be C/10 after three half-lives. Calculate the volume of the remaining liquid (in-ml)
The nuclei of a certain radioactive element are produced at a constant rate of α per second. This element has a decay constant λ . Initially N 0 nuclei of the element are present.
For a reaction A B at 27ºC , 1% reactant molecules possess activation energy, the energy of activation in K.cal/ mole is nearly(R = 2 cal K -1 mol -1 )
The nuclei of a certain radioactive element are produced at a constant rate of α per second. This element has a decay constant λ . Initially N 0 nuclei of the element are present. If in the above question α = 2 λ N 0 calculate the number of nuclei left in the element after one half life period of the element.
A B , ∆ H = – 10 J mol – 1 Ea(f) = 50 J mol -1 Then Ea(b) B A in k j mol -1 will be?
Which is the best description of an alpha particle?
Nuclides
Radioactive disintegration differs from a chemical change in being a/an
The emission of a particle from an unstable nucleus is called
92 238 U (III B, actinide series) emits one α -particle New element will be a/an
Which product is formed by α -emission from 92 235 U ?
Which results in the formation of an isotope of the parent element?
234 Th (III B) emits particles such that new element is in II A. Particles emitted one can be
One microcurie of radiation is the quantity of radioactive substance which produces
In the transformation of 92 U 238 to 92 U 234 involves one emission is α -particle, what should be the other emission(s)?
Decrease in atomic mass is not observed during
All of the statements about nuclear reactions are true except
The nuclear reaction 5 10 B + n ⟶ 3 7 Li + 2 4 He is of the type
The half-life of 11 24 Na is 15 hours. What percentage of it remains after 60 hours ?
The half-life of nickel- 65 is 2.5 days. How much of a 100 . 00 g sample has decayed after 7.5 days?
Which of the following is an artificial man-made series?
Which equation is true for transient equilibriunn? ( λ = disintegration constant; t = half-life )
A T 50 = 100 min N A B T 75 = 100 min N B ⟶ C At equilibrium N A N B is
The energy released in nuclear reactions corresponding to 1 amu is nearly
Binding energy due to mass defect of 2 4 He is 28 MeV. Thus, binding energy per nucleon is
Due to β -emission, n p ratio changes to
Which reaction is an example of chain reaction?
An atom bomb is based on the principle of
Moderator used in a nuclear reactor is
Fuel used in a breeder-reactor is
Which is based on nuclear fusion reaction?
Select the correct statement.
To trace the flow of blood, radioisotope used is
Ionising radiation is
Which of the following is not an example of ionising radiation?
Select the correct statement(s).
Ionising radiation is dangerous to living things because
35 X 88 is an unstable isotope, decays in two successive steps to produce stable(s) isotope 36 Y 87 ,as shown as X 88 35 I Z II 36 Y 87 The correct statement(s) is/are
