Surface Chemistry PYQs Set 6 (PDF)

Set 6 of 9 · Questions 151-180 of 248

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Surface Chemistry · Set 6 (Q151-180)
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151. $Position ofnon polar and polar part in micelle$ (1) $polar at outer surface but non polar at inner surface$ (2) $polar at inner surface non polar at outer surface$ (3) $distributed over all the surface$ (4) $are present in the surface only$ 152. $In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption (\frac{x}{m}) is directly proportionalto P^{x} . The value of X is:$ (1) $\infty$ (2) $1$ (3) $zero$ (4) $\frac{1}{n}$ 153. $During the action of enzyme 'zymase' glucose is converted into\dots\dots\dots with the liberation of carbon dioxide gas.$ (1) $phenol$ (2) $ethanol$ (3) $methanol$ (4) $isopropyl alcohol$ 154. $Consider the following about the Tyndall effect.(I) It is used to distinguish between a true and colloidal solution(II) It is possible only when the dispersed medium and dispersed phase differ much in their refractive indices(III)It is observed only when the size of colloidal particles is much smaller than the wavelength of the light usedThe correct statements are$ (1) $I & IIi only$ (2) $II & III only$ (3) $I, II & III$ (4) $I & II only$ 155. $Given below are two statements: one is labelled as Assertion (a) and the other is labelled as Reason (R) Assertion (a) : Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper. Reason (R) : Particles in a true solution cannot pass through parchment paper but the collodial particles can pass through the parchment paper. choose the correct answer from the options given below:$ (1) $Both (a) and (R) are correct and (R) is the correct explanation of (a)$ (2) $Both (a) and (R) are correct but (R) is not the correct explanation of (a)$ (3) $(a) is correct but (R) is not correct$ (4) $(a) is not correct but (R) is correct$ 156. $Which of the following is not the application of adsorption?$ (1) $Use of SiO_{2} gel for removing the moisture$ (2) $Use of coconut charcoal to separate inert gases$ (3) $Use of Al_{2} O_{3} to separate the components of organic mixture in chromatography$ (4) $Use of CaCl_{2} for removing the moisture$ 157. $The charges on the colloidal CdS sol and TiO_{2} sol are, respectively:$ (1) $positive and positive$ (2) $positive and negative$ (3) $negative and negative$ (4) $negative and positive$ 158. $Curdling of milk is caused due to the formation of which of the following acids by the bacteria?$ (1) $Formic acid$ (2) $Acetic acid$ (3) $Lactic acid$ (4) $Maleic acid$ 159. $The graph given below is showing the relation between the extent of adsorption (x / m) and Pressure at different temperatures. The correct order. of temperatures for curves i, ii and iii is$ (1) $T_{4} > T_{2} > T_{3}$ (2) $T_{4} > T_{3} > T_{2}$ (3) $T_{2} > T_{3} > T_{4}$ (4) $T_{2} > T_{4} > T_{3}$ 160. $Figure, a straight line is given for Freundrich Adsorption (y = 3x + 2.505). The value of \frac{1}{n} and log K are respectively.$ (1) $0.3 and log 2.505$ (2) $0.3 and 0.7033$ (3) $3 and 2.505$ (4) $3 and 0.7033$ 161. $With respect to drug-enzyme interaction, identify the wrong statement:$ (1) $Non-Competitive inhibitor binds to the allosteric site$ (2) $Allosteric inhibitor changes the enzyme's active site$ (3) $Allosteric inhibitor competes with the enzyme's active site$ (4) $Competitive inhibitor binds to the enzyme's active site$ 162. $Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. \frac{x}{m} is proportional to :$ (1) $p^{2}$ (2) $p$ (3) $p^{1/2}$ (4) $p^{1/4}$ 163. $Which of the following options are correct?$ (1) $A and C represent physisorption$ (2) $A and D represent physisorption$ (3) $A and C represent chemisorption$ (4) $B and C represent chemisorption$ 164. $The graph drawn between log (\frac{x}{m}) and log (p) is shown below with intercept OA . What is the value of (-) at a pressure of 0.3 atm ? (log 2 = 0.30, log 3 = 0.477)$ (1) $0.6$ (2) $0.5$ (3) $0.4$ (4) $0.7$ 165. $In Freundlich adsorption isotherm, slope of line is$ (1) $\frac{1}{n} with (\frac{1}{n} = 0 to 1)$ (2) $log \frac{1}{n} with n>1$ (3) $log n with n>1$ (4) $n with (n, 0.1 to 0.5)$ 166. $For Freundlich isotherm a graph of log \frac{x}{m} is plotted against log P . The slope of the line and its y -axis intercept, respectively corresponds to$ (1) $\frac{1}{n}, k$ (2) $log \frac{1}{n}, k$ (3) $\frac{1}{n}, log k$ (4) $log \frac{1}{n}, log k$ 167. $Absorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. \frac{x}{m} is proportional to:$ (1) $p^{2}$ (2) $p^{\frac{1}{4}}$ (3) $p^{\frac{1}{2}}$ (4) $p$ 168. $Which of the following curves is in accordance with Freundlich adsorption isotherm?$ (1) (2) (3) (4) 169. $Select the graph that correctly describes the adsorption isotherms at two temperatures T_{1} and T_{2} (T_{1} > T_{2}) for a gas : (x - mass of the gas adsorbed ;m - mass of adsorbent ; P - pressure)$ (1) (2) (3) (4) 170. $When silver nitrate solution is added to potassium iodide solution then the sol produced is :$ (1) $A g I / I^{-}$ (2) $A g I / A g^{+}$ (3) $K I / N O_{3}^{-}$ (4) $A g N O_{3} / N O_{3}^{-}$ 171. $Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot of \frac{x}{m} versus log p is shown in the given graph. \frac{x}{m} is proportional to:$ (1) $p^{2/3}$ (2) $p^{3/2}$ (3) $p^{3}$ (4) $p^{2}$ 172. $A particular adsorption process has the following characteristics: (i) It arises due to vander Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process:$ (1) $Enthalpy of adsorption is greater than 100 kJ m o l^{-1} .$ (2) $Adsorption is monolayer.$ (3) $Adsorption increases with increase in temperature.$ (4) $Energy of activation is low.$ 173. $The adsorption of a gas at the boiling point of the gas follows the isotherm shown in the figure. Identify the correct thermodynamic properties at point C .$ (1) $Δ H = T Δ S, Δ G = 0$ (2) $Δ H > T Δ S, Δ G = + ve$ (3) $Δ H < T Δ S, Δ G = - ve$ (4) $Δ H = T Δ S = Δ G = 0$ 174. $A gas undergoes physical adsorption on a surface and follows on a surface and follows the given Freundlich adsorption isotherm equation \frac{x}{m} = k p^{0.5} Adsorption of the gas increase with :$ (1) $Decrease in p and increase in T$ (2) $Decrease in p and decrease in T$ (3) $Increase in p and decrease in T$ (4) $Increase in p and increase in T$ 175. $The diameters range of colloidal particles is approximately.$ (1) $1 to 1000 nm$ (2) $1000 to 2000 nm$ (3) $2000 to 3000 nm$ (4) $3000 to 4000 nm$ 176. $The mass of gas adsorbed, x, per unit mass of absorbate, m, was measured at various pressures, p. A graph between log \frac{x}{m} and log p gives a straight line with slope equal to 2 andthe intercept equal to 0.4771. The value of \frac{x}{m} ata pressure of 4 atm is: (Given log 3 = 0.4771)$ 177. $If the initial pressure of a gas is 0.03 atm, the mass of the gas adsorbed per gram of the adsorbent is ______x 1 0^{- 2} g.$ 178. $The graph of log \frac{x}{m} vs log p for an adsorption process is a straight line inclined at an angle of 45° with intercept equal to 0.6020. The mass of gas adsorbed per unit mass of adsorbent at the pressure of 0.4 atm is______x 1 0^{- 1} (Nearest integer) Given: log 2 = 0.3010$ 179. $CH4 is adsorbed on 1 g charcoal at 00C following the Freundlich adsorption isotherm. 10.0 mL ofCH4is adsorbed at 100 mm of Hg, whereas 15.0 mL is adsorbed at 200 mm of Hg. The volume of CH4adsorbed at 300 mm of Hg is 10xmL. The value of x is ____\times10-2. (Nearest integer) [Use log10 2 = 0.3010, log10 3 = 0.4771]$ 180. $Silver (atomic weight = 108 gm m o l^{-1}) has a density of 10.5 gm c m^{-3} . The number of silver atoms on a surface of area 1 0^{-12} m^{2} can be expressed in scientific notation as y \times 1 0^{x} . The value of x is :$