Surface Chemistry PYQs Set 6 (PDF)

Set 6 of 8 · Questions 151-180 of 227

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Mere Teacher · Previous Year Questions NEET Chemistry · Surface Chemistry · Set 6 (Q151-180)
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151. $The graph drawn between log (\frac{x}{m}) and log (p) is shown below with intercept OA . What is the value of (-) at a pressure of 0.3 atm ? (log 2 = 0.30, log 3 = 0.477)$ (1) $0.6$ (2) $0.5$ (3) $0.4$ (4) $0.7$ 152. $In Freundlich adsorption isotherm, slope of line is$ (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) $n with (n, 0.1 to 0.5)$ 153. $For Freundlich isotherm a graph of log \frac{x}{m} is plotted against log P . The slope of the line and its y -axis intercept, respectively corresponds to$ (1) $\frac{1}{n}, k$ (2) $log \frac{1}{n}, k$ (3) $\frac{1}{n}, log k$ (4) $log \frac{1}{n}, log k$ 154. $Absorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. \frac{x}{m} is proportional to:$ (1) $p^{2}$ (2) $p^{\frac{1}{4}}$ (3) $p^{\frac{1}{2}}$ (4) $p$ 155. $Which of the following curves is in accordance with Freundlich adsorption isotherm?$ (1) (2) (3) (4) 156. $Select the graph that correctly describes the adsorption isotherms at two temperatures T_{1} and T_{2} (T_{1} > T_{2}) for a gas : (x - mass of the gas adsorbed ;m - mass of adsorbent ; P - pressure)$ (1) (2) (3) (4) 157. $When silver nitrate solution is added to potassium iodide solution then the sol produced is :$ (1) $A g I / I^{-}$ (2) $A g I / A g^{+}$ (3) $K I / N O_{3}^{-}$ (4) $A g N O_{3} / N O_{3}^{-}$ 158. $Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot of \frac{x}{m} versus log p is shown in the given graph. \frac{x}{m} is proportional to:$ (1) $p^{2/3}$ (2) $p^{3/2}$ (3) $p^{3}$ (4) $p^{2}$ 159. $A particular adsorption process has the following characteristics: (i) It arises due to vander Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process:$ (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) $Energy of activation is low.$ 160. $The adsorption of a gas at the boiling point of the gas follows the isotherm shown in the figure. Identify the correct thermodynamic properties at point C .$ (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) $Δ H = T Δ S = Δ G = 0$ 161. $A gas undergoes physical adsorption on a surface and follows on a surface and follows the given Freundlich adsorption isotherm equation \frac{x}{m} = k p^{0.5} Adsorption of the gas increase with :$ (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) $Increase in p and increase in T$ 162. $The diameters range of colloidal particles is approximately.$ (1) $1 to 1000 nm$ (2) $1000 to 2000 nm$ (3) $2000 to 3000 nm$ (4) $3000 to 4000 nm$ 163. $Match List - I with List - II. List -I (Colloid Preparation Method) (A) Hydrolysis (B) Reduction (C) Oxidation (D) Double Decomposition List -II (Chemical Reaction) (I) 2 AuCl_{3} + 3 HCHO + 3 H_{2} O ⟶ 2 Au (sol) + 3 HCOOH + 6 HCl (II) As_{2} O_{3} + 3 H_{2} S \to As_{2} S_{3} (sol) + 3 H_{2} O (III) SO_{2} + 2 H_{2} S \to 3 S (sol) + 2 H_{2} O (IV) FeCl_{3} + 3 H_{2} O \to Fe (OH)_{3} (sol) + 3 HCl Choose the most appropriate answer from the options given below.$ (1) $(A)-(i), (B)-(iii), (C)-(ii), (D)-(iv)$ (2) $(A)-(iv), (B)-(i), (C)-(iii), (D)-(ii)$ (3) $(A)-(iv), (B)-(ii), (C)-(iii), (D)-(i)$ (4) $(A)-(i), (B)-(ii), (C)-(iv), (D)-(iii)$ 164. $The colour of sky is due to$ (1) $absorption of light by atmospheric gases$ (2) $transmission of light$ (3) $wavelength of scattered light$ (4) $all of these.$ 165. $Catalysts in following reactions are (I) CH_{3} COOCH_{3} (l) + H_{2} O (l) \to CH_{3} COOH (aq) + CH_{3} OH (l) (II) 2 SO_{2} (g) \to 2 SO_{3} (g) (III) 2 SO_{2} (g) + O_{2} (g) \to 2 SO_{3} (g) (IV) N_{2} (g) + 3 H_{2} (g) \to 2 NH_{3} (g)$ (1) $HCl (l), Pt (s), NO (g) and Fe (s)$ (2) $HCl (l), NO (g), Pt (s) and Fe (s)$ (3) $HCl (l), Ni (s), NO (g) and Fe(s)$ (4) $HCl (l), Pt (s), N_{2} O (g) and Fe(s)$ 166. $Zeta potential is$ (1) $potential required to bring about coagulation of a colloidal sol$ (2) $potential required to give the particle a speed of 1 cm s^{- 1}$ (3) $potential difference between fixed charged layer and the diffused layer having opposite charges$ (4) $potential energy of the colloidal particles.$ 167. $The conditions given below are in the context of observing Tyndall effect in colloidal solutions:(A) The diameter of the colloidal particles is comparable to the wavelength of light used.(B) The diameter of the colloidal particles is much smaller than the wavelength of light used.(C) The diameter of the colloidal particles is much larger than the wavelength of light used.(D) The refractive indices of the dispersed phase and the dispersion medium are comparable.(E) The dispersed phase has a very different refractive index from the dispersion medium. Choose the most appropriate conditions from the options given below:$ (1) $(A) and (E) only$ (2) $(C) and (D) only$ (3) $(A) and (D) only$ (4) $(B) and (E) only$ 168. $Fog is a colloidal solution of$ (1) $solid in gas$ (2) $gas in gas$ (3) $liquid in gas$ (4) $gas in liquid.$ 169. $Peptization is a:$ (1) $process of bringing colloidal molecule into solution$ (2) $process of converting precipitate into colloidal solution$ (3) $process of converting a colloidal solution into precipitate$ (4) $process of converting soluble particles to form colloidal solution.$ 170. $An example for autocatalysis is$ (1) $oxidation of NO to NO_{2}$ (2) $oxidation of SO_{2} to SO_{3}$ (3) $decomposition of KClO_{3} to KCl and O_{2}$ (4) $oxidation of oxalic acid by acidified KMnO_{4} .$ 171. $Rate of physisorption increases with$ (1) $decrease in temperature$ (2) $increase in temperature$ (3) $decrease in pressure$ (4) $decrease in surface area$ 172. $Gold sol is not$ (1) $a macromolecular colloid$ (2) $a lyophobic colloid$ (3) $a multimolecular colloid$ (4) $negatively charged colloid.$ 173. $Tyndall effect is observed when$ (1) $The diameter of dispersed particles is much larger than the wavelength of light used.$ (2) $The diameter of dispersed particles is similar to the wavelength of light used.$ (3) $The diameter of dispersed particles is much smaller than the wavelength of light used.$ (4) $The refractive index of dispersed phase is greater than that of the dispersion medium.$ 174. $Lyophilic sols are$ (1) $Irreversible sols$ (2) $They are prepared from inorganic compound$ (3) $Coagulated by adding electrolytes$ (4) $Self-stabilizing$ 175. $Match the following: (I) Foam (A) Smoke (II) Gel (B) cell fluid (III) Aerosol (C) jellies (IV) Emulsion (D) rubber (E) froth (F) Milk$ (1) $(I)-(E), (II)-(C), (III)-(A), (IV)-(F)$ (2) $(I)-(B), (II)-(C), (III)-(E), (IV)-(D)$ (3) $(I)-(D), (II)-(B), (III)-(A), (IV)-(E)$ (4) $(I)-(D), (II)-(B), (III)-(E), (IV)-(F)$ 176. $Which of the following is used for the preparation of colloids?$ (1) $Van Arkel Method$ (2) $Bredig's Arc Method$ (3) $Mond Process$ (4) $Ostwald Process$ 177. $Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?$ (1) $CH3-(CH2)8 -COO- Na+$ (2) $CH3(CH2)11 N \oplus (CH3)3Br-$ (3) $CH3-(CH2)13-OSO3- Na+$ (4) $CH3(CH2)15 N \oplus (CH3)3Br-$ 178. $The most appropriate method of making egg-albumin sol is$ (1) $Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the yellow part of the content to 100 mL of 5% w/V saline solution and homogenize with a mechanical shaker.$ (2) $Break an egg carefully and transfer the transparent part of the content to 100 mL of 5% w/V saline solution and stir well.$ (3) $Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the white part of the content to 100 mL of 5% w/V saline solution and homogenize with a mechanical shaker.$ (4) $Break an egg carefully and transfer only the yellow part of the content to 100 mL of 5% w/V saline solution and stir well.$ 179. $Among the following, the false statement is:$ (1) $It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane.$ (2) $Tyndall effect can be used to distinguish between a colloidal solution and a true solution.$ (3) $Lyophilic sol can be coagulated by adding an electrolyte.$ (4) $Latex is a colloidal solution of rubber particles which are positively charged.$ 180. $In langmuir’s model of adsorption of a gas on a solid surface:$ (1) $the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered$ (2) $the adsorption at a single site on the surface may involve multiple molecules at the same time$ (3) $the mass of gas striking a given area of surface is proportional to the pressure of the gas$ (4) $the mass of gas striking a given area of surface is independent of the pressure of the gas$