Surface Chemistry PYQs Set 4 (PDF)

Set 4 of 9 · Questions 91-120 of 248

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Surface Chemistry · Set 4 (Q91-120)
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91. $Choose the correct reason(s) for the stability of the lyophobic colloidal particles.$ (1) $Preferential adsorption of ions on their surface from the solution.$ (2) $Preferential adsorption of solvent on their surface from the solution.$ (3) $Attraction between different particles having opposite charges on their surface.$ (4) $Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.$ 92. $The no. of positively and negatively charged sols respectively in the following are TiO_{2}, blood, CdS, Cu, Ag, Clay, SiO_{2}, Fe_{2} O_{3} .$ (1) $5,3$ (2) $3,5$ (3) $6,2$ (4) $4,4$ 93. $If x gram of gas is adsorbed by m gram of adsorbent at pressure P, the plot of log \frac{x}{m} versus log P is linear. The slope of the plot is: (n and k are constants and n > 1)$ (1) $2 k$ (2) $log k$ (3) $n$ (4) $\frac{1}{n}$ 94. $Which one of the following does not involve coagulation?$ (1) $Formation of delta regions$ (2) $Peptization$ (3) $Treatment of drinking water by potash alum$ (4) $Clotting of blood by the use of ferric chloride$ 95. $The macromolecular colloids of the following are I. Starch solution III. Synthetic detergent II. Sulphur sol IV. Synthetic rubber$ (1) $I, II$ (2) $II, III$ (3) $III, IV$ (4) $I, IV$ 96. $which property of colloidal solution is independent of charge on the colloidal particles?$ (1) $Electroosmosis$ (2) $Tyndall effect$ (3) $Coagulation$ (4) $Electrophoresis$ 97. $Aqueous solution of raw sugar when passed over beds of animal charcoal, it becomes colourless. Pick the correct set of terminologies that can be used for the above example. Adsorbent Adsorbate Process$ (1) $Solution of Sugar Animal Charcoal Sorption$ (2) $Animal Charcoal Solution of Sugar Absorption$ (3) $Animal Charcoal Colouring substance Adsorption$ (4) $Colouring Substance Animal Charcoal Adsorption$ 98. $Which can adsorb larger volume of hydrogen gas?$ (1) $Finely divided platinum$ (2) $Colloidal Fe (OH)_{3}$ (3) $Finely divided nickel$ (4) $Colloidal solution of palladium$ 99. $100 mL of 5% (w/v) solution of NaCl in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred well. This resulted in a/ an :$ (1) $Lyophilic sol$ (2) $Lyophobic sol$ (3) $Emulsion$ (4) $Precipitate$ 100. $Which of the following electrolyte will have maximum flocculation value for Fe (OH)_{3} sol?$ (1) $NaCl$ (2) $Na_{2} S$ (3) $(NH_{4})_{3} PO_{4}$ (4) $K_{2} SO_{4}$ 101. $According to the adsorption theory of catalysis, the speed of the reaction increases because$ (1) $the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption$ (2) $in the process of adsorption, the activation energy of the molecules becomes large$ (3) $adsorption produces heat which increases the speed of the reaction$ (4) $adsorption lowers the activation energy of the reaction.$ 102. $Match the following List-I(Process) (A) Ostwald’s process (B) Lead Chamber process (C) Deacon’s process (D) Haber’s process List-II(Catalyst) (I) NO (II) Fe (III) Rh (IV) CuCl_{2} The correct answer is$ (1) $A-IV, B-I, C-II, D-III$ (2) $A-II, B-III, C-IV, D-I$ (3) $A-III, B-I, C-IV, D-II$ (4) $A-III, B-IV, C-I, D-II$ 103. $The charge on colloidal particles is due to$ (1) $presence of electrolyte$ (2) $very small size of particles$ (3) $adsorption of ions from the solution$ (4) $can't be determined$ 104. $The greater the valence of the flocculating ion added, the greater is its power to cause precipitation of a colloid. This rule is$ (1) $Hund's rule$ (2) $Pauling rule$ (3) $Henry's rule$ (4) $Hardy - Schulze rule$ 105. $The INCORRECT statements below regarding colloidal solutions is:$ (1) $A colloidal solution shows colligative properties.$ (2) $An ordinary filter paper can stop the flow of colloidal particles.$ (3) $The flocculating power of Al^{3 +} is more than that of Na^{+}$ (4) $A colloidal solution shows Brownian motion of colloidal particles.$ 106. $The plot of log \frac{x}{m} (y-axis) and log p (x-axis) is a straight line inclined at an angle of 45^{\circ} . When the intercept, K is 10 and pressure is 0.3 atm the amount of solute in grams adsorbed per gram of adsorbent (log 3 = 0.4771) ?$ (1) $30.0$ (2) $2.0$ (3) $3.0$ (4) $20.0$ 107. $10 mL of 1 mM surfactant solution forms a monolayer covering 0.24 cm² on a polar substrate. If the polar head is approximated as cube, what is its edge length?$ (1) $1.0 pm$ (2) $2.0 pm$ (3) $0.1 nm$ (4) $2.0 nm$ 108. $3 gram of activated charocoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the fitrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :$ (1) $18 mg$ (2) $36 mg$ (3) $42 mg$ (4) $54 mg$ 109. $Which of the following is not a characteristic of chemisorption?$ (1) $Adsorption is highly specific$ (2) $Heat of adsorption is around 400 kJ mol^{- 1}$ (3) $The process is irreversible$ (4) $It forms multimolecular layer$ 110. $For the coagulation of a negative sol, the species below, that has the highest flocculating power is:$ (1) $SO_{4}^{2 -}$ (2) $Ba^{2 +}$ (3) $Na^{+}$ (4) $PO_{4}^{3 -}$ 111. $Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of the following is a correct statement?$ (1) $I moves faster and has higher R_{f} value than II$ (2) $II moves faster and has higher R_{f} value than I$ (3) $I moves slower and has higher R_{f} value than II$ (4) $II moves slower and has higher R_{f} value than I$ 112. $Which one of the following is used as an eye lotion?$ (1) $Milk of magnesia$ (2) $Silver sol$ (3) $Colloidal antimony$ (4) $Chromium salt sol$ 113. $Match the following List-I A. Negatively charged sol B. Milk C. Gold number D. Colloidal antimony List-II I. Emulsion II. Kalaazar III. FeCl_{3} solution is added to excess NaOH solution IV. Protection of colloids The correct answer is$ (1) $A-III, B-I, C-II, D-IV$ (2) $A-III, B-I, C-IV, D-II$ (3) $A-I, B-III, C-IV, D-II$ (4) $A-II, B-I, C-III, D-IV$ 114. $According to Freundlich adsorption isotherm which of the following is correct?$ (1) $\frac{x}{m} \propto p^{0}$ (2) $\frac{X}{m} \propto p^{1}$ (3) $\frac{X}{m} \propto p^{1/ n}$ (4) $All the above are correct for different ranges of pressure.$ 115. $Consider the following statements for a gold sol (I) It is macromolecular colloid (II) It is a lyophobic sol (III)It is a negatively charged sol (IV) It is a multimolecular colloid (V) It is an associated colloid The correct statements are$ (1) $I, II, III only$ (2) $II, III, IV only$ (3) $III, IV, V only$ (4) $I, IV, V only$ 116. $The sol formed in the following unbalanced equation is As_{2} O_{3} + H_{2} S \to$ (1) $As_{2} S_{2}$ (2) $As_{2} S_{3}$ (3) $As$ (4) $S$ 117. $Statement I : For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration. Statement II : For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential choose the correct answer from the options given below.$ (1) $Statement I is true but Statement II is false$ (2) $Statement I is false but Statement II is true$ (3) $Both Statement I and Statement II are true$ (4) $Both Statement 1 and Statement II are false$ 118. $Four gases A, B, C and D have critical temperatures 5.3, 33.2, 126.0 and 154.3 K respectively. For their adsorption on a fixed amount of charcoal, the correct order is:$ (1) $D > C > B > A$ (2) $C > B > D > A$ (3) $D > C > A > B$ (4) $C > D > B > A$ 119. $Given below are the critical temperatures of some of the gases : Gas Critical temperature (K) He 5.2 C H_{4} 190 C O_{2} 304.2 N H_{3} 405.5 The gas showing least adsorption on a definite amount of charcoal is :$ (1) $He$ (2) $C H_{4}$ (3) $C O_{2}$ (4) $N H_{3}$ 120. $For the adsorption of hydrogen on platinum, the activation energy is 30 k Jmol^{- 1} and for the adsorption of hydrogen on nickel, the activation energy is 41.4 k Jmol^{- 1} . The logarithm of the ratio of the rates of chemisorption on equal areas of the metals at 300 K is (Nearest integer) Given: ln 10 = 2.3 R = 8.3 J K^{- 1} mol^{- 1}$