{"id":617528,"date":"2023-02-25T11:53:06","date_gmt":"2023-02-25T11:53:06","guid":{"rendered":"https:\/\/www.indcareer.com\/schools\/?p=617528"},"modified":"2024-05-02T11:10:22","modified_gmt":"2024-05-02T11:10:22","slug":"ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry","status":"publish","type":"post","link":"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/","title":{"rendered":"NCERT Exemplar Class 12 Chemistry\u00a0Chapter 5: Surface Chemistry"},"content":{"rendered":"\n<p>NCERT Exemplar Class 12 Chemistry&nbsp;Chapter 5: Surface Chemistry. NCERT Exemplar Solutions for Class 12 Chemistry&nbsp;Chapter 5 Surface Chemistry prepare students for their Class 12 exams thoroughly. <\/p>\n\n\n\n<p>Chemistry&nbsp;problems and solutions for the Class 12 pdf are provided here which are similar to the questions being asked in the previous year&#8217;s board. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ncert-exemplar-class-12-chemistry-nbsp-chapter-5-surface-chemistry\"><strong>NCERT Exemplar Class 12 Chemistry&nbsp;Chapter 5: Surface Chemistry<\/strong><\/h2>\n\n\n\n<p>Class 12: Chemistry&nbsp;Chapter 5 solutions. Complete Class 12 Chemistry&nbsp;Chapter 5 Notes.<\/p>\n\n\n\n<p><strong>Multiple Choice Questions (Type-I)<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Which of the following process does not occur at the interface of phases?\n<ul class=\"wp-block-list\">\n<li>(i) crystallisation<\/li>\n\n\n\n<li>(ii) heterogenous catalysis<\/li>\n\n\n\n<li>(iii) homogeneous catalysis<\/li>\n\n\n\n<li>(iv) corrosion<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>At the equilibrium position in the process of adsorption ___________.\n<ul class=\"wp-block-list\">\n<li>(i) \u0394H &gt; 0<\/li>\n\n\n\n<li>(ii) \u0394H = T\u0394S<\/li>\n\n\n\n<li>(iii) \u0394H &gt; T\u0394S<\/li>\n\n\n\n<li>(iv) \u0394H &lt; T\u0394S<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following interface cannot be obtained?\n<ul class=\"wp-block-list\">\n<li>(i) liquid-liquid<\/li>\n\n\n\n<li>(ii) solid-liquid<\/li>\n\n\n\n<li>(iii) liquid-gas<\/li>\n\n\n\n<li>(iv) gas-gas<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>The term \u2018sorption\u2019 stands for ____________.\n<ul class=\"wp-block-list\">\n<li>(i) absorption<\/li>\n\n\n\n<li>(ii) adsorption<\/li>\n\n\n\n<li>(iii) both absorption and adsorption<\/li>\n\n\n\n<li>(iv) desorption<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Extent of physisorption of a gas increases with ___________.\n<ul class=\"wp-block-list\">\n<li>(i) increase in temperature.<\/li>\n\n\n\n<li>(ii) decrease in temperature.<\/li>\n\n\n\n<li>(iii) decrease in surface area of adsorbent.<\/li>\n\n\n\n<li>(iv) decrease in strength of van der Waals forces.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Extent of adsorption of adsorbate from solution phase increases with ________.\n<ul class=\"wp-block-list\">\n<li>(i) increase in amount of adsorbate in solution.<\/li>\n\n\n\n<li>(ii) decrease in surface area of adsorbent.<\/li>\n\n\n\n<li>(iii) increase in temperature of solution.<\/li>\n\n\n\n<li>(iv) decrease in amount of adsorbate in solution.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which one of the following is not applicable to the phenomenon of adsorption?\n<ul class=\"wp-block-list\">\n<li>(i) \u0394H &gt; 0<\/li>\n\n\n\n<li>(ii) \u0394G &lt; 0<\/li>\n\n\n\n<li>(iii) \u0394S &lt; 0<\/li>\n\n\n\n<li>(iv) \u0394H &lt; 0<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following is not a favourable condition for physical adsorption?\n<ul class=\"wp-block-list\">\n<li>(i) high pressure<\/li>\n\n\n\n<li>(ii) negative \u0394H<\/li>\n\n\n\n<li>(iii) higher critical temperature of adsorbate<\/li>\n\n\n\n<li>(iv) high temperature<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Physical adsorption of a gaseous species may change to chemical adsorption with ______________.\n<ul class=\"wp-block-list\">\n<li>(i) decrease in temperature<\/li>\n\n\n\n<li>(ii) increase in temperature<\/li>\n\n\n\n<li>(iii) increase in surface area of adsorbent<\/li>\n\n\n\n<li>(iv) decrease in surface area of adsorbent<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In physisorption adsorbent does not show specificity for any particular gas because ______________.\n<ul class=\"wp-block-list\">\n<li>(i) involved van der Waals forces are universal.<\/li>\n\n\n\n<li>(ii) gases involved behave like ideal gases.<\/li>\n\n\n\n<li>(iii) enthalpy of adsorption is low.<\/li>\n\n\n\n<li>(iv) it is a reversible process.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following is an example of absorption?\n<ul class=\"wp-block-list\">\n<li>(i) Water on silica gel<\/li>\n\n\n\n<li>(ii) Water on calcium chloride<\/li>\n\n\n\n<li>(iii) Hydrogen on finely divided nickel<\/li>\n\n\n\n<li>(iv) Oxygen on metal surface<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>On the basis of data given below predict which of the following gases shows least adsorption on a definite amount of charcoal?<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/15761445301_1cdf7d63d7_o.jpg\" alt=\"\">\n<ul class=\"wp-block-list\">\n<li>(i) CO<sub>2<\/sub><\/li>\n\n\n\n<li>(ii) SO<sub>2<\/sub><\/li>\n\n\n\n<li>(iii) CH<sub>4<\/sub><\/li>\n\n\n\n<li>(iv) H<sub>2<\/sub><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In which of the following reactions heterogenous catalysis is involved?<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/15143347464_20d37460ce_o.jpg\" alt=\"\">\n<ul class=\"wp-block-list\">\n<li>(i) (b), (c)<\/li>\n\n\n\n<li>(ii) (b), (c), (d)<\/li>\n\n\n\n<li>(iii) (a), (b), (c)<\/li>\n\n\n\n<li>(iv) (d)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>At high concentration of soap in water, soap behaves as ____________.\n<ul class=\"wp-block-list\">\n<li>(i) molecular colloid<\/li>\n\n\n\n<li>(ii) associated colloid<\/li>\n\n\n\n<li>(iii) macromolecular colloid<\/li>\n\n\n\n<li>(iv) lyophilic colloid<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following will show Tyndall effect?\n<ul class=\"wp-block-list\">\n<li>(i) Aqueous solution of soap below critical micelle concentration.<\/li>\n\n\n\n<li>(ii) Aqueous solution of soap above critical micelle concentration.<\/li>\n\n\n\n<li>(iii) Aqueous solution of sodium chloride.<\/li>\n\n\n\n<li>(iv) Aqueous solution of sugar.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Method by which lyophobic sol can be protected.\n<ul class=\"wp-block-list\">\n<li>(i) By addition of oppositely charged sol.<\/li>\n\n\n\n<li>(ii) By addition of an electrolyte.<\/li>\n\n\n\n<li>(iii) By addition of lyophilic sol.<\/li>\n\n\n\n<li>(iv) By boiling.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.\n<ul class=\"wp-block-list\">\n<li>(i) coagulation<\/li>\n\n\n\n<li>(ii) electrolysis<\/li>\n\n\n\n<li>(iii) diffusion<\/li>\n\n\n\n<li>(iv) peptisation<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following electrolytes will have maximum coagulating value for AgI\/Ag<sup>+<\/sup> sol?\n<ul class=\"wp-block-list\">\n<li>(i) Na<sub>2<\/sub>S<\/li>\n\n\n\n<li>(ii) Na<sub>3<\/sub>PO<sub>4<\/sub><\/li>\n\n\n\n<li>(iii) Na<sub>2<\/sub>SO<sub>4<\/sub><\/li>\n\n\n\n<li>(iv) NaCl<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ____________.\n<ul class=\"wp-block-list\">\n<li>(i) solid sol<\/li>\n\n\n\n<li>(ii) gel<\/li>\n\n\n\n<li>(iii) emulsion<\/li>\n\n\n\n<li>(iv) sol<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles __________________.\n<ul class=\"wp-block-list\">\n<li>(i) exhibit enormous surface area.<\/li>\n\n\n\n<li>(ii) remain suspended in the dispersion medium.<\/li>\n\n\n\n<li>(iii) form lyophilic colloids.<\/li>\n\n\n\n<li>(iv) are comparatively less in number.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Arrange the following diagrams in correct sequence of steps involved in the&nbsp;mechanism of catalysis, in accordance with modern adsorption theory.<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/15143904153_cff7617f4c_o.jpg\" alt=\"\">\n<ul class=\"wp-block-list\">\n<li>(i) a \u2192 b \u2192 c \u2192 d \u2192 e<\/li>\n\n\n\n<li>(ii) a \u2192 c \u2192 b \u2192 d \u2192 e<\/li>\n\n\n\n<li>(iii) a \u2192 c \u2192 b \u2192 e \u2192 d<\/li>\n\n\n\n<li>(iv) a \u2192 b \u2192 c \u2192 e \u2192 d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following process is responsible for the formation of delta at a&nbsp;place where rivers meet the sea?\n<ul class=\"wp-block-list\">\n<li>(i) Emulsification<\/li>\n\n\n\n<li>(ii) Colloid formation<\/li>\n\n\n\n<li>(iii) Coagulation<\/li>\n\n\n\n<li>(iv) Peptisation<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following curves is in accordance with Freundlich adsorption&nbsp;isotherm?<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/15143347394_c5b7389bdb_o.jpg\" alt=\"\"><\/li>\n\n\n\n<li>Which of the following process is not&nbsp;responsible for the presence of electric&nbsp;charge on the sol particles?\n<ul class=\"wp-block-list\">\n<li>(i) Electron capture by sol particles.<\/li>\n\n\n\n<li>(ii) Adsorption of ionic species from solution.<\/li>\n\n\n\n<li>(iii) Formation of Helmholtz electrical double layer.<\/li>\n\n\n\n<li>(iv) Absorption of ionic species from solution.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following phenomenon is applicable to the process shown in the Fig.?<br><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/15143347384_910d0b9d7c_o.jpg\" alt=\"\">\n<ul class=\"wp-block-list\">\n<li>(i) Absorption<\/li>\n\n\n\n<li>(ii) Adsorption<\/li>\n\n\n\n<li>(iii) Coagulation<\/li>\n\n\n\n<li>(iv) Emulsification<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Multiple Choice Questions (Type-II)<\/strong><\/p>\n\n\n\n<p><strong>Note : In the following questions two or more options may be correct.<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Which of the following options are correct?\n<ul class=\"wp-block-list\">\n<li>(i) Micelle formation by soap in aqueous solution is possible at all temperatures.<\/li>\n\n\n\n<li>(ii) Micelle formation by soap in aqueous solution occurs above a particular concentration.<\/li>\n\n\n\n<li>(iii) On dilution of soap solution micelles may revert to individual ions.<\/li>\n\n\n\n<li>(iv) Soap solution behaves as a normal strong electrolyte at all&nbsp;concentrations.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following statements are correct about solid catalyst?\n<ul class=\"wp-block-list\">\n<li>(i) Same reactants may give different product by using different catalysts.<\/li>\n\n\n\n<li>(ii) Catalyst does not change \u0394H of reaction.<\/li>\n\n\n\n<li>(iii) Catalyst is required in large quantities to catalyse reactions.<\/li>\n\n\n\n<li>(iv) Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Freundlich adsorption isotherm is given by the expression x\/m = Kp <sup>1\/n<\/sup> which of the following conclusions can be drawn from this expression.\n<ul class=\"wp-block-list\">\n<li>(i) When 1\/n = 0, the adsorption is independent of pressure.<\/li>\n\n\n\n<li>(ii) When 1\/n = 0, the adsorption is directly proportional to pressure.<\/li>\n\n\n\n<li>(iii) When n = 0, x\/m vs p graph is a line parallel to x-axis.<\/li>\n\n\n\n<li>(iv) When n = 0, plot of x\/m vs p is a curve.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>H<sub>2<\/sub> gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to ____________.\n<ul class=\"wp-block-list\">\n<li>(i) very strong van der Waal\u2019s interaction.<\/li>\n\n\n\n<li>(ii) very weak van der Waals forces.<\/li>\n\n\n\n<li>(iii) very low critical temperature.<\/li>\n\n\n\n<li>(iv) very high critical temperature.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following statements are correct?\n<ul class=\"wp-block-list\">\n<li>(i) Mixing two oppositely charged sols neutralises their charges and stabilises the colloid.<\/li>\n\n\n\n<li>(ii) Presence of equal and similar charges on colloidal particles provides stability to the colloids.<\/li>\n\n\n\n<li>(iii) Any amount of dispersed liquid can be added to emulsion without destabilising it.<\/li>\n\n\n\n<li>(iv) Brownian movement stabilises sols.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>An emulsion cannot be broken by __________ and ___________.\n<ul class=\"wp-block-list\">\n<li>(i) heating<\/li>\n\n\n\n<li>(ii) adding more amount of dispersion medium<\/li>\n\n\n\n<li>(iii) freezing<\/li>\n\n\n\n<li>(iv) adding emulsifying agent<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following substances will precipitate the negatively charged emulsions?\n<ul class=\"wp-block-list\">\n<li>(i) KCl<\/li>\n\n\n\n<li>(ii) glucose<\/li>\n\n\n\n<li>(iii) urea<\/li>\n\n\n\n<li>(iv) NaCl<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following colloids cannot be coagulated easily?\n<ul class=\"wp-block-list\">\n<li>(i) Lyophobic colloids.<\/li>\n\n\n\n<li>(ii) Irreversible colloids.<\/li>\n\n\n\n<li>(iii) Reversible colloids.<\/li>\n\n\n\n<li>(iv) Lyophilic colloids.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>What happens when a lyophilic sol is added to a lyophobic sol?\n<ul class=\"wp-block-list\">\n<li>(i) Lyophobic sol is protected.<\/li>\n\n\n\n<li>(ii) Lyophilic sol is protected.<\/li>\n\n\n\n<li>(iii) Film of lyophilic sol is formed over lyophobic sol.<\/li>\n\n\n\n<li>(iv) Film of lyophobic sol is formed over lyophilic sol.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?\n<ul class=\"wp-block-list\">\n<li>(i) Reverse osmosis takes place.<\/li>\n\n\n\n<li>(ii) Electroosmosis takes place.<\/li>\n\n\n\n<li>(iii) Dispersion medium begins to move.<\/li>\n\n\n\n<li>(iv) Dispersion medium becomes stationary.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In a reaction, catalyst changes ____________.\n<ul class=\"wp-block-list\">\n<li>(i) physically<\/li>\n\n\n\n<li>(ii) qualitatively<\/li>\n\n\n\n<li>(iii) chemically<\/li>\n\n\n\n<li>(iv) quantitatively<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Which of the following phenomenon occurs when a chalk stick is dipped in ink?\n<ul class=\"wp-block-list\">\n<li>(i) adsorption of coloured substance<\/li>\n\n\n\n<li>(ii) adsorption of solvent<\/li>\n\n\n\n<li>(iii) absorption and adsorption both of solvent<\/li>\n\n\n\n<li>(iv) absoprtion of solvent<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Short Answer Type Questions<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Why is it important to have clean surface in surface studies?<\/li>\n\n\n\n<li>Why is chemisorption referred to as activated adsorption?<\/li>\n\n\n\n<li>What type of solutions are formed on dissolving different concentrations of soap in water?<\/li>\n\n\n\n<li>What happens when gelatin is mixed with gold sol?<\/li>\n\n\n\n<li>How does it become possible to cause artificial rain by spraying silver iodide on the clouds?<\/li>\n\n\n\n<li>Gelatin which is a peptide is added in icecreams. What can be its role?<\/li>\n\n\n\n<li>What is collodion?<\/li>\n\n\n\n<li>Why do we add alum to purify water?<\/li>\n\n\n\n<li>What happens when electric field is applied to colloidal solution?<\/li>\n\n\n\n<li>What causes brownian motion in colloidal dispersion?<\/li>\n\n\n\n<li>A colloid is formed by adding FeCl<sub>3<\/sub> in excess of hot water. What will happen if excess sodium chloride is added to this colloid?<\/li>\n\n\n\n<li>How do emulsifying agents stabilise the emulsion?<\/li>\n\n\n\n<li>hy are some medicines more effective in the colloidal form?<\/li>\n\n\n\n<li>Why does leather get hardened after tanning?<\/li>\n\n\n\n<li>How does the precipitation of colloidal smoke take place in Cottrell precipitator?<\/li>\n\n\n\n<li>How will you distinguish between dispersed phase and dispersion medium in an emulsion?<\/li>\n\n\n\n<li>On the basis of Hardy-Schulze rule explain why the coagulating power of phosphate is higher than chloride.<\/li>\n\n\n\n<li>Why does bleeding stop by rubbing moist alum?<\/li>\n\n\n\n<li>Why is Fe(OH)<sub>3<\/sub> colloid positively charged, when prepared by adding FeCl<sub>3<\/sub> to hot water?<\/li>\n\n\n\n<li>Why do physisorption and chemisorption behave differently with rise in temperature?<\/li>\n\n\n\n<li>What happens when dialysis is prolonged?<\/li>\n\n\n\n<li>Why does the white precipitate of silver halide become coloured in the presence of dye eosin.<\/li>\n\n\n\n<li>What is the role of activated charcoal in gas mask used in coal mines?<\/li>\n\n\n\n<li>How does a delta form at the meeting place of sea and river water?<\/li>\n\n\n\n<li>Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.<\/li>\n\n\n\n<li>Why is desorption important for a substance to act as good catalyst?<\/li>\n\n\n\n<li>What is the role of diffusion in heterogenous catalysis?<\/li>\n\n\n\n<li>How does a solid catalyst enhance the rate of combination of gaseous molecules?<\/li>\n\n\n\n<li>Do the vital functions of the body such as digestion get affected during fever? Explain your answer.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Matching&nbsp;Type Questions<\/h3>\n\n\n\n<p><strong>Note : Match the items of Column I and Column II in the following questions.<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"67\">\n<li>Method of formation of solution is given in Column I. Match it with the type of\u00a0solution given in Column II.<br>Column IColumn II(i) Sulphur vapours passed through cold water(a) Normal electrolyte solution(ii) Soap mixed with water above critical micelle concentration(b) Molecular colloids(iii) White of egg whipped with water(c) Associated colloid(iv) Soap mixed with water below critical micelle concentration(d) Macro molecular colloids<\/li>\n\n\n\n<li>Match the statement given in Column I with the phenomenon given in\u00a0Column II.<br>Column IColumn IIi) Dispersion medium moves in an electric field(a) Osmosis(ii) Solvent molecules pass through semi permeable membrane towards solvent side(b) Electrophoresis(iii) Movement of charged colloidal particles under the influence of<br>applied electricpotential towards oppositely charged electrodes(c) Electroosmosis(iv) Solvent molecules pass through semi permeable membranes towardssolution side(d) Reverse osmosis<\/li>\n\n\n\n<li>Match the items given in Column I and Column II.<br>Column IColumn II(i) Protective colloid(a) FeCl<sub>3<\/sub>\u00a0+ NaOHii) Liquid \u2013 liquid colloid(b) Lyophilic colloidsiii) Positively charged colloid(c) Emulsioniv) Negatively charged colloid(d) FeCl<sub>3<\/sub>\u00a0+ hot water<\/li>\n\n\n\n<li>Match the types of colloidal systems given in Column I with the name given in\u00a0Column II.<br>Column IColumn II(i) Solid in liquida) Foamii) Liquid in solidb) Soliii) Liquid in liquidc) Geliv) Gas in liquidd) Emulsion<\/li>\n\n\n\n<li>Match the items of Column I and Column II.<br>Column IColumn II(i) Dialysis(a) Cleansing action of soap(ii) Peptisation(b) Coagulation(iii) Emulsification(c) Colloidal sol formation(iv) Electrophoresis(d) Purification<\/li>\n\n\n\n<li>Match the items of Column I and Column II.<br>Column IColumn II(i) Buttera) dispersion of liquid in liquid(ii) Pumice stoneb) dispersion of solid in liquid(iii) Milkc) dispersion of gas in solid(iv) Paintsd) dispersion of liquid in solid<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Assertion and Reason Type Questions<\/h3>\n\n\n\n<p>Note : In the following questions a statement of assertion followed by a&nbsp;statement of reason is given. Choose the correct answer out of the following&nbsp;choices.<br>(i) Assertion and reason both are correct and the reason is correct explanation&nbsp;of assertion.<br>(ii) Assertion and reason both are correct but reason does not explain&nbsp;assertion.<br>iii) Assertion is correct but reason is incorrect.<br>(iv) Both assertion and reason are incorrect.<br>(v) Assertion is incorrect but reason is correct.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"73\">\n<li><strong>Assertion :<\/strong>\u00a0An ordinary filter paper impregnated with collodion solution\u00a0stops the flow of colloidal particles.<br><strong>Reason :<\/strong>\u00a0Pore size of the filter paper becomes more than the size of\u00a0colloidal particle.<\/li>\n\n\n\n<li><strong>Assertion :<\/strong>\u00a0Colloidal solutions show colligative properties.<br><strong>Reason :<\/strong>\u00a0Colloidal particles are large in size.<\/li>\n\n\n\n<li><strong>Assertion :<\/strong>\u00a0Colloidal solutions do not show brownian motion.<br><strong>Reason :<\/strong>\u00a0Brownian motion is responsible for stability of sols.<\/li>\n\n\n\n<li><strong>Assertion :<\/strong>\u00a0Coagulation power of Al<sup>3+<\/sup>\u00a0is more than Na+.<br><strong>Reason :<\/strong>\u00a0Greater the valency of the flocculating ion added, greater is\u00a0its power to cause precipitation (Hardy Schulze rule).<\/li>\n\n\n\n<li><strong>Assertion :<\/strong>\u00a0Detergents with low CMC are more economical to use.<br><strong>Reason :<\/strong>\u00a0Cleansing action of detergents involves the formation of\u00a0micelles. These are formed when the concentration of\u00a0detergents becomes equal to CMC.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Long Answer Type Questions<\/h3>\n\n\n\n<ol class=\"wp-block-list\" start=\"78\">\n<li>What is the role of adsorption in heterogenous catalysis?<\/li>\n\n\n\n<li>What are the applications of adsorption in chemical analysis?<\/li>\n\n\n\n<li>What is the role of adsorption in froth floatation process used especially for\u00a0concentration of sulphide ores?<\/li>\n\n\n\n<li>\u00a0What do you understand by shape selective catalysis? Why are zeolites good\u00a0shape selective catalysts?<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Answers<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49058190236_16a61f4b6b_o.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49058422457_1757ba8f1b_o.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49058255591_c2eb5e97fd_o.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49058260056_3eb0c66f64_o.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49057707068_9f9aee8d28_o.png\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49058220741_0f62e92ed1_o.png\" alt=\"\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-\"><img decoding=\"async\" src=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2024\/05\/49058449222_1d1e736cbe_o.png\"><\/h2>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-problems-solutions\/\" style=\"background-color:#f06d6d\" target=\"_blank\" rel=\"noreferrer noopener\">NCERT Exemplar Solutions<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background wp-element-button\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-important-questions\/\" style=\"background-color:#f06d6d\" target=\"_blank\" rel=\"noreferrer noopener\">NCERT Class 12 Exemplar Solutions<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Exemplar Class 12 Chemistry&nbsp;Chapter 5: Surface Chemistry. NCERT Exemplar Solutions for Class 12 Chemistry&nbsp;Chapter 5 Surface Chemistry prepare students for their Class 12 exams thoroughly. Chemistry&nbsp;problems and solutions for the Class 12 pdf are provided here which are similar to the questions being asked in the previous year&#8217;s board. NCERT Exemplar Class 12 Chemistry&nbsp;Chapter [&hellip;]<\/p>\n","protected":false},"author":302,"featured_media":617530,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"newspack_show_updated_date":false,"footnotes":""},"categories":[1411,25],"tags":[],"boards":[],"class_list":["post-617528","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-book-solutions","category-class-12","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Exemplar for Class 12, Chemistry Chapter 5 - IndCareer Schools<\/title>\n<meta name=\"description\" content=\"NCERT Exemplar Class 12 Chemistry\u00a0Chapter 5: Surface Chemistry | Browse all Class 12 Chemistry\u00a0Chapters NCERT Exemplar books - IndCareer Schools\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Exemplar Class 12 Chemistry\u00a0Chapter 5: Surface Chemistry\" \/>\n<meta property=\"og:description\" content=\"NCERT Exemplar Class 12 Chemistry&nbsp;Chapter 5: Surface Chemistry. NCERT Exemplar Solutions for Class 12 Chemistry&nbsp;Chapter 5 Surface Chemistry\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/\" \/>\n<meta property=\"og:site_name\" content=\"IndCareer Schools\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/indcareer\" \/>\n<meta property=\"article:published_time\" content=\"2023-02-25T11:53:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-02T11:10:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/indcareer-schools-2-46-7-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"901\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Pooja\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@indcareer\" \/>\n<meta name=\"twitter:site\" content=\"@indcareer\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Pooja\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/\"},\"author\":{\"name\":\"Pooja\",\"@id\":\"https:\/\/www.indcareer.com\/schools\/#\/schema\/person\/d6945cf059726f162259ba738092301e\"},\"headline\":\"NCERT Exemplar Class 12 Chemistry\u00a0Chapter 5: Surface Chemistry\",\"datePublished\":\"2023-02-25T11:53:06+00:00\",\"dateModified\":\"2024-05-02T11:10:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/\"},\"wordCount\":2212,\"publisher\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.indcareer.com\/schools\/wp-content\/uploads\/2023\/02\/indcareer-schools-2-46-7-scaled.jpg\",\"articleSection\":[\"Book Solutions\",\"Class 12\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/\",\"url\":\"https:\/\/www.indcareer.com\/schools\/ncert-exemplar-class-12-chemistry-chapter-5-surface-chemistry\/\",\"name\":\"NCERT Exemplar for Class 12, Chemistry Chapter 5 - 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