{"id":31351,"date":"2022-02-18T14:02:47","date_gmt":"2022-02-18T08:32:47","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=31351"},"modified":"2024-03-06T11:34:13","modified_gmt":"2024-03-06T06:04:13","slug":"is-matter-around-us-pure-class-9-extra-questions-science-chapter-2","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/","title":{"rendered":"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/#Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Science_Chapter_2\" title=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2\">Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/#Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Very_Short_Answer_Questions\" title=\"Is Matter Around Us Pure Class 9 Extra Questions Very Short Answer Questions\">Is Matter Around Us Pure Class 9 Extra Questions Very Short Answer Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/#Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Short_Answer_Questions-I\" title=\"Is Matter Around Us Pure Class 9 Extra Questions Short Answer Questions-I\">Is Matter Around Us Pure Class 9 Extra Questions Short Answer Questions-I<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/#Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Short_Answer_Questions-II\" title=\"Is Matter Around Us Pure Class 9 Extra Questions Short Answer Questions-II\">Is Matter Around Us Pure Class 9 Extra Questions Short Answer Questions-II<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/#Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Long_Answer_Questions\" title=\"Is Matter Around Us Pure Class 9 Extra Questions Long Answer Questions\">Is Matter Around Us Pure Class 9 Extra Questions Long Answer Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/#Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Hots_Higher_Order_Thinking_Skills\" title=\"Is Matter Around Us Pure Class 9 Extra Questions Hots (Higher Order Thinking Skills)\">Is Matter Around Us Pure Class 9 Extra Questions Hots (Higher Order Thinking Skills)<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Science_Chapter_2\"><\/span>Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Extra Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Very_Short_Answer_Questions\"><\/span>Is Matter Around Us Pure Class 9 Extra Questions Very Short Answer Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nHow can you change a saturated solution to an unsaturated solution without adding any more solvent to it?<br \/>\nAnswer:<br \/>\nBy heating the saturated solution, it becomes unsaturated.<\/p>\n<p>Question 2.<br \/>\nSucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be a pure substance or a mixture? Give reasons for the same. [NCERT Exemplar]\nAnswer:<br \/>\nIt is a pure substance because chemical composition of sugar crystals is same irrespective of its source.<\/p>\n<p>Question 3.<br \/>\nBased on which factor a solution is said to be diluted, concentrated or saturated?<br \/>\nAnswer:<br \/>\nA solution is said to be diluted, concentrated or saturated on the basis of the amount of solute dissolved in the solution.<\/p>\n<p>Question 4.<br \/>\nIdentify solute and solvent in \u2018tincture of iodine\u2019.<br \/>\nAnswer:<br \/>\nIodine is the solute and alcohol is the solvent.<\/p>\n<p>Question 5.<br \/>\nWhat is mass per cent of a solution?<br \/>\nAnswer:<br \/>\nIt is defined as the mass in grams of the solute present in one hundred grams of a solution.<\/p>\n<p>Question 6.<br \/>\nWhat are the two components of a colloidal solution?<br \/>\nAnswer:<br \/>\nThe two components of a colloidal solution are dispersed phase and dispersing medium.<\/p>\n<p>Question 7.<br \/>\nIn what respect does a true solution differ from a colloidal solution?<br \/>\nAnswer:<br \/>\nA true solution is homogeneous whereas a colloidal solution is heterogeneous.<\/p>\n<p>Question 8.<br \/>\nTwo liquids \u2018A\u2019 and \u2018B\u2019 are miscible with each other at room temperature. Which separation technique will you apply to separate the mixture of \u2018A\u2019 and \u2018B\u2019 if the difference in their boiling points is 27\u00b0C?<br \/>\nAnswer:<br \/>\nWe can separate two miscible liquids by fractional distillation, if both the liquids have difference in their boiling points. So, the mixture of liquids \u2018A\u2019 and \u2018B\u2019 can be separated by fractional distillation.<\/p>\n<p>Question 9.<br \/>\nDefine crystallisation.<br \/>\nAnswer:<br \/>\nIt is a process that separates a pure solid in the form of its crystals from a solution.<\/p>\n<p>Question 10.<br \/>\nWhy is crystallisation technique considered better than simple evaporation to purify solids?<br \/>\nAnswer:<br \/>\nCrystallisation is considered better than simple evaporation because<\/p>\n<ul>\n<li>some solids decompose or get charred on heating to dryness.<\/li>\n<li>some impurities may remain dissolved in the solution even after filtration. On evaporation, these contaminate the solid.<\/li>\n<\/ul>\n<p>Question 11.<br \/>\nWhy is water called universal solvent?<br \/>\nAnswer:<br \/>\nWater is known as universal solvent because it has the ability to dissolve wide variety of substances.<\/p>\n<p>Question 12.<br \/>\nWhich of the following are physical changes?<br \/>\nMelting of iron metal, rusting of iron, bending of iron rod, drawing a wire of iron metal.<br \/>\nAnswer:<br \/>\nMelting of iron metal, bending of iron rod and drawing a wire of iron metal are physical changes because there is no change in the chemical composition of iron, only its form is changing.<\/p>\n<p>Question 13.<br \/>\nName two elements which exist in liquid state at room temperature.<br \/>\nAnswer:<br \/>\nGallium and mercury exist in liquid state at room temperature.<\/p>\n<p>Question 14.<br \/>\nAn unknown substance \u2018A\u2019 on thermal decomposition produces \u2018B\u2019 and \u2018C\u2019. What is \u2018A\u2019\u2014an element, a compound or a mixture?<br \/>\nAnswer:<br \/>\nUnknown substance \u2018A\u2019 should be a compound because elements and mixture do not decompose.<\/p>\n<p>Question 15.<br \/>\nIdentify the elements from the following substances: sulphur, brine, hydrochloric acid, water, neon, paper, sugar.<br \/>\nAnswer:<br \/>\nThe elements are sulphur and neon.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Short_Answer_Questions-I\"><\/span>Is Matter Around Us Pure Class 9 Extra Questions Short Answer Questions-I<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\n\u2018Sea water can be classified as homogeneous as well as heterogeneous mixture.\u2019 Comment. [NCERT Exemplar]\nAnswer:<br \/>\nSea water is a mixture of salts and water which cannot be separated except by evaporation. Therefore, sea water is considered homogeneous.<br \/>\nSea water also contains mud, decayed plant, etc., other than salts and water, so it is heterogeneous also.<\/p>\n<p>Question 2.<br \/>\nWhy is it not possible to distinguish particles of a solute from the solvent in solution?<br \/>\nAnswer:<br \/>\nA true solution is homogeneous in nature. The solute and solvent particles are very small. They cannot be distinguished even under a microscope.<\/p>\n<p>Question 3.<br \/>\nExplain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do. [NCERT Exemplar]\nAnswer:<br \/>\nParticle size in a suspension is larger than those in a colloidal solution. Also molecular interaction in a suspension is not strong enough to keep the particles suspended and hence they settle down.<\/p>\n<p>Question 4.<br \/>\nIdentify colloids and true solutions from the following:<br \/>\nPond water, fog, aluminium paint, vinegar and glucose solution.<br \/>\nAnswer:<br \/>\nTrue solutions are vinegar and glucose solution. Colloids are fog, aluminium paint.<\/p>\n<p>Question 5.<br \/>\nGive two examples each for<\/p>\n<ul>\n<li>Aerosol,<\/li>\n<li>Emulsion.<\/li>\n<\/ul>\n<p>Answer:<\/p>\n<ul>\n<li>Aerosol: Clouds, smoke<\/li>\n<li>Emulsion: Milk, face cream.<\/li>\n<\/ul>\n<p>Question 6.<br \/>\nSmoke and fog both are aerosols. In what way are they different? [NCERT Exemplar]\nAnswer:<br \/>\nBoth fog and smoke have gas as the dispersion medium. The only difference is that the dispersed phase in fog is liquid and in smoke it is a solid.<\/p>\n<p>Question 7.<br \/>\nWhat do you understand by the term distillation? Give its one application.<br \/>\nAnswer:<br \/>\nDistillation is a process of boiling a liquid and then condensing the vapour obtained into a liquid. This process is used to obtain wines from the sugarcane juice.<\/p>\n<p>Question 8.<br \/>\nWhile diluting a solution of salt in water, a student by mistake added acetone (boiling point 56\u00b0C). What technique can be employed to get back the acetone? Justify your choice. [NCERTExemplar]\nAnswer:<br \/>\nDistillation is used to get back acetone. We know that boiling point of water is 100\u00b0C and since acetone is more volatile it will separate out first.<\/p>\n<p>Question 9.<br \/>\nDefine chromatography and give its one application.<br \/>\nAnswer:<br \/>\nChromatography is a technique used for the separation of a mixture of solutes brought about by distribution of dissolved material between two immiscible phases, one of which is mobile phase and the other part is stationary phase. It is useful in forensic science to detect and identify trace amounts of substances in the contents of bladder or stomach.<\/p>\n<p>Question 10.<br \/>\nRain water stored in a tank contains sand grains, unfiltrable clay particles, calcium carbonate, salt, pieces of paper and some air bubbles. Select from amongst these one example each of a solvent, a solute, a colloid and a suspension.<br \/>\nAnswer:<br \/>\nSolvent \u2013 water Solute \u2013 salt<br \/>\nColloid \u2013 air bubbles Suspension \u2013 clay particles.<\/p>\n<p>Question 11.<br \/>\nClassify the following as physical or chemical properties:<br \/>\n(a) The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.<br \/>\n(b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.<br \/>\n(c) Metallic sodium is soft enough to be cut with a knife.<br \/>\n(d) Most metal oxides form alkalis on interacting with water. [NCERT Exemplar]\nAnswer:<br \/>\nPhysical properties\u2014(a) and (c)<br \/>\nChemical properties\u2014(b) and (d)<\/p>\n<p>Question 12.<br \/>\nGive two points of differences between an element and a compound.<br \/>\nAnswer:<\/p>\n<table border=\"2\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" width=\"291\"><strong>Element<\/strong><\/td>\n<td style=\"text-align: center;\" width=\"290\"><strong>Compound<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"291\">1. An element is made up of same kind of atoms.<\/td>\n<td width=\"290\">1. A compound is obtained from different kinds of atoms.<\/td>\n<\/tr>\n<tr>\n<td width=\"291\">2. An element cannot be split by physical or chemical methods.<\/td>\n<td width=\"290\">2. A compound can be split into new substances by chemical methods.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Question 13.<br \/>\nWhich of the following are not compounds?<br \/>\n(a) Chlorine gas<br \/>\n(b) Potassium chloride<br \/>\n(c) Iron<br \/>\n(d) Iron sulphide<br \/>\n(e) Aluminium<br \/>\n(f) Iodine<br \/>\n(g) Carbon<br \/>\n(h) Carbon monoxide<br \/>\n(i) Sulphur powder<br \/>\nAnswer:<br \/>\nChlorine gas, iron, aluminium, iodine, carbon, sulphur powder.<\/p>\n<p>Question 14.<br \/>\nIs water an element or a compound? Give reason in support of your statement<br \/>\nAnswer:<br \/>\nWater is a compound because of the following reasons:<\/p>\n<ul>\n<li>It is composed of two different elements, hydrogen and oxygen which cannot be separated by physical methods. They can be separated only by electrolysis.<\/li>\n<li>The physical and chemical properties of hydrogen and oxygen are entirely different from the properties of water.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Short_Answer_Questions-II\"><\/span>Is Matter Around Us Pure Class 9 Extra Questions Short Answer Questions-II<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nIdentify the dispersed phase and dispersing medium in the following colloids.<br \/>\n(a) Fog<br \/>\n(b) Cheese<br \/>\n(c) Coloured gemstone<br \/>\nAnswer:<br \/>\n(a) Fog\u2014liquid, gas<br \/>\n(b) Cheese\u2014liquid, solid<br \/>\n(c) Coloured gemstone\u2014solid, solid<\/p>\n<p>Question 2.<br \/>\nDescribe any three properties of colloid.<br \/>\nAnswer:<\/p>\n<ul>\n<li>It is a heterogenous mixture.<\/li>\n<li>Size of particles is too small to be seen by naked eye.<\/li>\n<li>They scatter light passing through them making its path visible.<\/li>\n<li>They do not settle down when left undisturbed.<\/li>\n<li>They cannot be separated by the process of filtration, (any three points)<\/li>\n<\/ul>\n<p>Question 3.<br \/>\nState the principle of separating two immiscible liquids by separating funnel. Describe an activity with diagram to separate a mixture of water and kerosene oil.<br \/>\nAnswer:<br \/>\nImmiscible layers separate out in layers depending on their densities in separating funnel.<br \/>\nActivity to separate kerosene oil from water using a separating funnel:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130496\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-1.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 1\" width=\"284\" height=\"289\" \/><\/p>\n<ul>\n<li>Pour the mixture of kerosene oil and water in separating funnel as shown in figure.<\/li>\n<li>Let it stand undisturbed for sometime so that separate layers of oil and water are formed.<\/li>\n<li>Open the stopcock of the separating funnel and pour out the lower layer of water carefully.<\/li>\n<li>Close the stopcock of the separating funnel as the oil reaches the stopcock.<\/li>\n<\/ul>\n<p>Question 4.<br \/>\nWhat would you observe when<br \/>\n(a) a saturated solution of potassium chloride prepared at 60\u00b0C is allowed to cool at room temperature?<br \/>\n(b) an aqueous sugar solution is heated to dryness?<br \/>\n(c) a mixture of iron filings and sulphur powder is heated strongly? [NCERT Exemplar]\nAnswer:<br \/>\n(a) Solid potassium chloride will separate out.<br \/>\n(b) Initially the water will evaporate and then sugar will get charred.<br \/>\n(c) Iron sulphide will be formed.<\/p>\n<p>Question 5.<br \/>\nSuggest separation technique (s) one would need to employ to separate the following mixtures:<br \/>\n(a) Mercury and water<br \/>\n(b) Potassium chloride and ammonium chloride<br \/>\n(c) Common salt, water and sand<br \/>\n(d) Kerosene oil, water and salt. [NCERT Exemplar]\nAnswer:<br \/>\n(a) Separation by using separating funnel<br \/>\n(b) Sublimation<br \/>\n(c) Filtration to separate sand followed by evaporation\/distillation<br \/>\n(d) Separation by using separating funnel to separate kerosene oil followed by evaporation or distillation.<\/p>\n<p>Question 6.<br \/>\nName the process associated with the following:<br \/>\n(a) Dry ice is kept at room temperature and at one atmospheric pressure.<br \/>\n(b) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.<br \/>\n(c) An acetone bottle is left open and the bottle becomes empty.<br \/>\n(d) Milk is churned to separate cream from it.<br \/>\n(e) Settling of sand when a mixture of sand and water is left undisturbed for some time.<br \/>\n(f) Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths. [NCERT Exemplar]\nAnswer:<br \/>\n(a) Sublimation<br \/>\n(b) Dissolution\/diffusion<br \/>\n(c) Evaporation\/diffusion<br \/>\n(d) Centrifugation<br \/>\n(e) Sedimentation<br \/>\n(f) Scattering of light (Tyndall effect).<\/p>\n<p>Question 7.<br \/>\nOn heating, calcium carbonate gets converted into calcium oxide and carbon dioxide.<br \/>\n(a) Is this a physical or a chemical change?<br \/>\n(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved. [NCERT Exemplar]\nAnswer:<br \/>\n(a) Chemical change.<br \/>\n(b) Acidic and basic solutions can be prepared by dissolving the products of the above process in water.<br \/>\nCaO + H<sub>2<\/sub>O \u2192 Ca(OH)<sub>2<\/sub> (basic solution)<br \/>\nCO<sub>2<\/sub> + H<sub>2<\/sub>O \u2192 H<sub>2<\/sub>CO<sub>3<\/sub> (acidic solution)<\/p>\n<p>Question 8.<br \/>\nNon-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.<br \/>\n(a) Name a lustrous non-metal.<br \/>\n(b) Name a non-metal which exists as a liquid at room temperature.<br \/>\n(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.<br \/>\n(d) Name a non-metal which is known to form the largest number of compounds.<br \/>\n(e) Name a non-metal other than carbon which shows allotropy.<br \/>\n(f) Name a non-metal which is required for combustion. [NCERT Exemplar]\nAnswer:<br \/>\n(a) Iodine<br \/>\n(b) Bromine<br \/>\n(c) Graphite<br \/>\n(d) Carbon<br \/>\n(e) Sulphur<br \/>\n(f) Oxygen<\/p>\n<p>Question 9.<br \/>\nClassify the following into metals, non-metals and metalloids:<br \/>\n(i) Germanium<br \/>\n(ii) Boron<br \/>\n(iii) Diamond<br \/>\n(iv) Iodine<br \/>\n(v) Copper<br \/>\n(vi) Helium.<br \/>\nAnswer:<br \/>\nMetal \u2013 Copper<br \/>\nNon-metals \u2013 Diamond, iodine and helium<br \/>\nMetalloids \u2013 Germanium, boron.<\/p>\n<p>Question 10.<br \/>\nClassify the following into elements, compounds and mixtures.<br \/>\n(i) Pure sand<br \/>\n(ii) Air<br \/>\n(iii) Ammonia gas<br \/>\n(iv) Ice<br \/>\n(v) Glass<br \/>\n(vi) CaO.<br \/>\nAnswer:<br \/>\nElements \u2013 Nil<br \/>\nCompounds \u2013 Pure sand, Ice, CaO, Ammonia gas<br \/>\nMixture \u2013 Air, Glass.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Long_Answer_Questions\"><\/span>Is Matter Around Us Pure Class 9 Extra Questions Long Answer Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\nDifferentiate between a true solution and a colloid.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130497\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-2.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 2\" width=\"737\" height=\"219\" \/><\/p>\n<p>Question 2.<br \/>\nDistinguish between physical change and chemical change.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130499\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-3.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 3\" width=\"736\" height=\"299\" \/><\/p>\n<p>Question 3.<br \/>\nDistinguish between metals and non-metals.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130500\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-4.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 4\" width=\"736\" height=\"309\" \/><\/p>\n<p>Question 4.<br \/>\nDistinguish between compounds and mixtures.<br \/>\nAnswer:<\/p>\n<p>Question 5.<br \/>\nA group of students took an old shoe box and covered it with a black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. They placed a milk sample contained in a beaker\/tumbler in the box as shown in the figure. They were amazed to see that milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it.<br \/>\n(a) Explain why the milk sample was illuminated. Name the phenomenon involved.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130502\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-6.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 6\" width=\"535\" height=\"242\" \/><br \/>\n(b) Same results were not observed with a salt solution. Explain.<br \/>\n(c) Can you suggest two more solutions which would show the same effect as shown by the milk solution? [NCERT Exemplar]\nAnswer:<br \/>\n(a) Milk is a colloid. If a beam of light is put on a milk sample contained in a beaker, the path of light beam is illuminated and becomes visible when seen from the other side. This is because the colloidal particles are big enough to scatter light falling on them. This scattered light enters our eyes and we are able to see the path of light beam.<br \/>\nThe scattering of light by colloidal particles is known as Tyndall effect.<br \/>\n(b) Salt solution is a true solution. If a beam of light is put on a salt solution kept in a beaker in a dark room, the path of light beam is not visible inside the solution when seen from the other side. This is because salt particles present in it are so small that they cannot scatter light rays falling on them.<br \/>\n(c) Detergent solution, sulphur solution.<\/p>\n<p>Question 6.<br \/>\nFractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process? Explain using a diagram. [NCERT Exemplar]\nAnswer:<br \/>\nThe fractionating column packed with glass beads provides a surface for the vapours to collide and lose energy so that they can be quickly condensed and distilled. Also, length of the column would increase the efficiency of separation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130503\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-7.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 7\" width=\"596\" height=\"499\" \/><\/p>\n<p>Question 7.<br \/>\nA child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. The filter paper was removed when the water moved near the top of the filter paper.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130504\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-8.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 8\" width=\"210\" height=\"202\" \/><br \/>\n(i) What would you expect to see, if the ink contains three different coloured components?<br \/>\n(ii) Name the technique used by the child.<br \/>\n(iii) Suggest one more application of this technique. [NCERT Exemplar]\nAnswer:<br \/>\n(i) The colour component which is more soluble in water dissolves first, rises faster and produces a colour band (spot) on the paper at a higher position. The less soluble colour components dissolve a little later, rise slower and form coloured bands at lower heights. In this way, three different bands will be observed.<br \/>\n(ii) Chromatography<br \/>\n(iii) To separate the pigments present in chlorophyll.<\/p>\n<p>Question 8.<br \/>\nYou are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture. [NCERT Exemplar]\nAnswer:<\/p>\n<ul>\n<li>Removing iron filings from the mixture by magnetic separation. Take the mixture in a petri dish and roll a bar magnet over it. Iron filings will get attach to the magnet and thus separate from the mixture.<\/li>\n<li>Removing ammonium chloride by sublimation Transfer the remaining mixture into China dish and heat it. On heating, ammonium chloride sublimes and solidifies on condensation. The mixture containing sand and sodium chloride left behind in the China dish.<\/li>\n<li>Removing sand by filtration Make a solution of sand and sodium chloride in water. Filter the solution. Sodium chloride will dissolve in water and sand is left as residue on the filter paper.<\/li>\n<li>Evaporate the filtrate to dryness to get sodium chloride or by crystallisation.<\/li>\n<\/ul>\n<p>Question 9.<br \/>\nClassify each of the following as a physical or a chemical change. Give reasons.<br \/>\n(a) Drying of a shirt in the sun.<br \/>\n(b) Rising of hot air over a radiator.<br \/>\n(c) Burning of kerosene in a lantern.<br \/>\n(d) Change in the colour of black tea on adding lemon juice to it.<br \/>\n(e) Churning of milk cream to get butter. [NCERT Exemplar]\nAnswer:<br \/>\n(a) It is a physical change because water is converted from its liquid state to gaseous state because of the sun\u2019s heat.<br \/>\n(b) It is a physical change because water in the radiator is converted from a liquid state to gaseous state.<br \/>\n(c) It is a chemical change because combustion of kerosene occurs and new products are formed.<br \/>\n(d) It is a chemical change because there is a reaction between the citric acid in the lemon and the compounds of tea resulting in formation of new products.<br \/>\n(e) It is a physical change because the cream suspended in the milk is separated by churning.<\/p>\n<p>Question 10.<br \/>\nShow diagrammatically how water is purified in the waterworks system and list the processes involved.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130505\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-9.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 9\" width=\"713\" height=\"240\" \/><\/p>\n<p>Question 11.<br \/>\nIron filings and sulphur were mixed together and divided into two parts \u2018A\u2019 and \u2018S\u2019. Part \u2018A\u2019 was heated strongly while Part \u2018S\u2019 was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?<br \/>\n[NCERT Exemplar]\nAnswer:<br \/>\nPart A<br \/>\n\\(\\mathrm{Fe}(s)+\\mathrm{S}(s) \\quad \\stackrel{\\mathrm{Heat}}{\\longrightarrow} \\quad \\mathrm{FeS}(s)\\)<br \/>\nFeS(s) + 2HCl(aq) \u2192 FeCl<sub>2<\/sub>(aq) + H<sub>2<\/sub>S(g)<\/p>\n<p>Part B<br \/>\nFe(i) + S(s) \u2192 Mixture of iron filings and sulphur<br \/>\nWhen dilute HCl is added to it<br \/>\nFe(s) + S(s) + 2HCl(aq) \u2192 FeCl<sub>2<\/sub>(aq) + H<sub>2<\/sub>(g)<br \/>\nSulphur remains unreacted.<br \/>\nH<sub>2<\/sub>S gas formed has a foul smell and on passing through lead acetate solution, it turns the solution black. Hydrogen gas burns with a pop sound.<\/p>\n<p><strong>Numericals<\/strong><br \/>\nQuestion 1.<br \/>\n0.5 g of salt is dissolved in 25 g of water. Calculate the percentage amount of the salt in the solution.<br \/>\nSolution:<br \/>\nMass of salt present = 0.5 g<br \/>\nMass of water present in solution = 25 g<br \/>\n\u2234 Percentage amount of the salt = \\(\\frac{0.5}{0.5+25} \\times 100\\) = 1.96%<\/p>\n<p>Question 2.<br \/>\nA solution of urea in water contains 16 grams of it in 120 grams of solution. Find out the mass percentage of the solution.<br \/>\nSolution:<br \/>\nMass of urea present in solution = 16 g<br \/>\nMass of solution = 120 g<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130506\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-10.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 10\" width=\"352\" height=\"122\" \/><\/p>\n<p>Question 3.<br \/>\nA solution has been prepared by mixing 5.6 mL of alcohol with 75 mL of water. Calculate the percentage (by volume) of alcohol in the solution.<br \/>\nSolution:<br \/>\nVolume of alcohol present in solution = 5.6 mL<br \/>\nVolume of water = 75 mL<br \/>\nTotal volume of solution = (75 + 5.6) mL = 80.6 mL<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130507\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-11.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 11\" width=\"511\" height=\"134\" \/><\/p>\n<p>Question 4.<br \/>\nA solution contains 30 g of glucose, 20 g of salt in 500 mL of water. Calculate the mass per cent of<br \/>\n(a) glucose,<br \/>\n(b) salt (density of water = 1 g \/mL).<br \/>\nSolution:<br \/>\nMass of glucose present in the solution = 30 g<br \/>\nMass of salt present in the solution = 20 g<br \/>\nMass of water = 500 g<br \/>\nTotal mass of the solution = (30 + 20 + 500)g<br \/>\n= 550 g<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130508\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-12.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 12\" width=\"390\" height=\"253\" \/><\/p>\n<p>Question 5.<br \/>\nDuring an experiment the students were asked to prepare a 10% (Mass\/Mass) solution of sugar in water. Ramesh dissolved 10 g of sugar in 100 g of water while Sarika prepared it by dissolving 10 g of sugar in water to make 100 g of the solution. [NCERT Exemplar]\n(a) Are the two solutions of the same concentration?<br \/>\n(b) Compare the mass % of the two solutions.<br \/>\nSolution:<br \/>\n(a) No.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130509\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-13.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 13\" width=\"443\" height=\"266\" \/><br \/>\nThe solution prepared by Sarika has a higher mass per cent than that prepared by Ramesh.<\/p>\n<p>Question 6.<br \/>\nCalculate the mass of sodium sulphate required to prepare its 20% (mass per cent) solution in 100 g of water. [NCERT Exemplar]\nSolution:<br \/>\nLet the mass of sodium sulphate required be x g.<br \/>\nThe mass of solution would be = (x + 100)g<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130510\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-14.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 14\" width=\"214\" height=\"151\" \/><br \/>\nSo, the mass of sodium sulphate required is 25 g.<\/p>\n<p>Question 7.<br \/>\nCalculate the mass of water and glucose required to make 250 g of 40% solution of glucose.<br \/>\nSolution:<br \/>\nMass of solution = 250g<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-130511\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Is-Matter-Around-Us-Pure-Class-9-Extra-Questions-Science-Chapter-2-15.png\" alt=\"Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 15\" width=\"390\" height=\"98\" \/><br \/>\n\u2234 Mass of glucose = \\(\\frac{40 \\times 250}{100}\\) = 100g<br \/>\nMass of solution = Mass of glucose + Mass of water<br \/>\nSo, Mass of water = Mass of solution \u2013 Mass of glucose<br \/>\n= 250g \u2013 100g = 150g<\/p>\n<p>Question 8.<br \/>\nHow much water should be mixed with 12 mL of alcohol so as to obtain 12% alcohol solution?<br \/>\nSolution:<br \/>\nVolume of solute =12 mL<br \/>\nLet the volume of water = x mL<br \/>\nVolume of solution = (12 + x) mL<br \/>\nConcentration of solution = \\(\\frac{\\text { Volume of solute }}{\\text { Volume of solution }} \\times 100\\)<br \/>\n\\(12=\\frac{12}{12+x} \\times 100\\)<br \/>\n12 + x = 100<br \/>\nx = 100 \u2013 12 = 88mL<br \/>\nSo, 88 mL of water should be mixed.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_Matter_Around_Us_Pure_Class_9_Extra_Questions_Hots_Higher_Order_Thinking_Skills\"><\/span>Is Matter Around Us Pure Class 9 Extra Questions Hots (Higher Order Thinking Skills)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Question 1.<br \/>\n(a) Under which category of mixtures will you classify alloys and why?<br \/>\n(b) A solution is always a liquid. Comment.<br \/>\n(c) Can a solution be heterogeneous? [NCERT Exemplar]\nAnswer:<br \/>\n(a) Alloys are homogeneous mixture of two or more elements because the constituent elements mix together and give a mixture which is uniform throughout.<br \/>\n(b) No, solid solutions and gaseous solutions are also possible.<br \/>\nExamples are brass, air.<br \/>\n(c) No, a solution cannot be heterogeneous in nature.<\/p>\n<p>Question 2.<br \/>\nThe teacher instructed three students A\u2019, \u2018B\u2019 and \u2018C\u2019 respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). \u2018A\u2019 dissolved 50 g of NaOH in 100 mL of water, \u2018B\u2019 dissolved 50 g of NaOH in 100 g of water while \u2018C\u2019 dissolved 50 g of NaOH in water to make 100 mL of solution. Which one of them has made the desired solution and why? [NCERT Exemplar]\nAnswer:<br \/>\n\u2018C\u2019 has made the desired solution because 50% (mass by volume) solution means 50g of solute dissolved in 100 mL of solution.<br \/>\nMass by volume per cent = \\(\\frac{\\text { Mass of solute }}{\\text { Volume of solution }} \\times 100\\)<br \/>\n= \\(\\frac{50}{100} \\times 100\\) = 50% mass by volume.<\/p>\n<p>Question 3.<br \/>\nExplain why filter paper cannot be used to separate colloids.<br \/>\nAnswer:<br \/>\nThe size of colloidal particles is less than lnm, while the size of pores present in an ordinary filter paper is larger than lnm. Hence, a colloidal solution cannot be separated by filtration.<\/p>\n<p>Question 4.<br \/>\nThree students A, B and C prepared mixtures using chalk powder, common salt and milk respectively in water. Whose mixture:<br \/>\n(i) would not leave residue on filter paper after filtration?<br \/>\n(ii) would show Tyndall effect?<br \/>\n(iii) would give transparent\/clear solution?<br \/>\n(iv) would settle down at the bottom when left undisturbed?<br \/>\n(v) could be filtered by filter paper?<br \/>\nAnswer:<br \/>\n(i)<\/p>\n<ul>\n<li>Mixture of common salt and water.<\/li>\n<li>Mixture of milk and water.<\/li>\n<\/ul>\n<p>(ii) Mixtures of chalk powder with water and milk with water.<br \/>\n(iii) Mixture of common salt and water.<br \/>\n(iv) Mixture of chalk powder and water.<br \/>\n(v) Mixture of chalk powder and water.<\/p>\n<p>Question 5.<br \/>\nCan we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain. [NCERT Exemplar]\nAnswer:<br \/>\nWe cannot separate alcohol dissolved in water by using separating funnel because both the components are highly soluble in each other. They can be separated by fractional distillation.<\/p>\n<p>Question 6.<br \/>\nWhat is the reason for running cold water through condenser from lower side to upper side in distillation process?<br \/>\nAnswer:<br \/>\nIn distillation process condensation of vapours take place. To absorb more heat, cold water is passed from lower side so that it will stay for longer time and absorb more heat from the vapours to form liquid state of the substance.<\/p>\n<p>Question 7.<br \/>\nYou are given two samples of water labelled as \u2018A\u2019 and \u2018B\u2019. Sample \u2018A\u2019 boils at 100\u00b0C and sample \u2018B\u2019 boils at 102\u00b0C. Which sample of water will not freeze at 0\u00b0C? Comment. [ NCERT Exemplar]\nAnswer:<br \/>\nSample \u2018B\u2019 will not freeze at 0\u00b0C because it is not pure water. At 1 atm, the boiling point of pure water is 100\u00b0C and the freezing point of pure water is 0\u00b0C.<\/p>\n<h4><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 Extra Questions for Class 9 Science Chapter 2 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Get Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 on Infinity learn","custom_permalink":"study-material\/class-9\/science\/chapter-2\/is-matter-around-us-pure-class-9-extra-questions-science-chapter-2\/"},"categories":[116,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2 - 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