Surface Chemistry PYQs Set 8 (PDF)

Set 8 of 9 · Questions 211-240 of 248

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Surface Chemistry · Set 8 (Q211-240)
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211. $Among the following, correct statement is:$ (1) $One would expect charcoal to adsorb chlorine more than hydrogen sulphide$ (2) $Sols metal sulphides are lyophilic$ (3) $Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.$ (4) $Brownian movement is more pronounced for smaller particles than for bigger-particles.$ 212. $In Freundlich adsorption isotherm, the value of 1 l n is$ (1) $between 0 and 1 in all cases$ (2) $between 2 and 4 in all cases$ (3) $1 in case of physical absorption$ (4) $1 in case of chemisorption.$ 213. $For the adsorption of a gas on a solid, the plot of versus l o g P is linear with slope equal to$ (1) $n$ (2) $1 l n$ (3) $k$ (4) $l o g k .$ 214. $Among the following the number of curves not in accordance with Freundlich adsorption isotherm is$ (1) (2) (3) (4) 215. $Kraft temperature is the temperature$ (1) $below which the aqueous solution of detergents starts freezing.$ (2) $above which the formation of micelles takes place.$ (3) $below which the formation of micelles takes place.$ (4) $above which the aqueous solution of detergents starts boiling.$ 216. $A plot of lo g (x / m) versus lo g p for the adsorption of a gas on a solid gives a straight line with slope equal to$ (1) $l o g K$ (2) $- l o g K$ (3) $n$ (4) $\frac{1}{n}$ 217. $Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold. Reason R : The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles. choose the most appropriate answer from the options given below:$ (1) $Both A and R are true and R is the correct explanation of A$ (2) $Both A and R are true but R is NOT the correct explanation of A$ (3) $A is true but R is false$ (4) $A is false but R is true$ 218. $Which one of the following is an example for homogeneous catalysis?$ (1) $Manufacture of sulphuric acid by contact process$ (2) $Manufacture of ammonia by Haber's process$ (3) $Hydrolysis of sucrose in presence of dilute hydrochloric acid$ (4) $Hydrogenation of oil$ 219. $If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?$ (1) $x l m = f_{(} p_{)} at constant T$ (2) $x l m = f_{(} T_{)} at constant p$ (3) $p = f_{(} T_{)} at constant$ (4) $\frac{x}{m} = p \times T$ 220. $Among the following, the false statement is:$ (1) $It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane.$ (2) $Lyophilic solution can be coagulated by adding an electrolyte$ (3) $Latex is a colloidal solution of rubber particles which are positively charged$ (4) $Tyndall effect can be used to distinguish between a colloidal solution and a true solution$ 221. $Which of the following is true for spontaneous adsorption of H_{2} gas without dissociation on solid surface$ (1) $Process is exothermic and Δ S < 0$ (2) $Process is endothermic and Δ S > 0$ (3) $Process is exothermic and Δ S > 0$ (4) $Process is endothermic and Δ S < 0$ 222. $The protecting power of lyophilic colloidal sol is expressed in terms of$ (1) $coagulation value$ (2) $gold number$ (3) $critical micelle concentration$ (4) $oxidation number.$ 223. $Relatively which conditions favour the faster Brownian movement of colloidal particles in solution?$ (1) $Smaller size and higher viscosity$ (2) $Smaller size and lesser viscosity$ (3) $Bigger size and higher viscosity$ (4) $Bigger size and lesser viscosity$ 224. $An example for hydrophobic sol among the following is \dots\dots...$ (1) $gum solution$ (2) $arsenic sulphide solution$ (3) $starch solution$ (4) $protein solution$ 225. $The sol given below with negatively charged colloidal particles is :$ (1) $F e C l_{3} added to hot water$ (2) $KIadded to A g N O_{3} solution$ (3) $A g N O_{3} added to KI solution$ (4) $A l_{2} O_{3} \cdot x H_{2} O in water$ 226. $The process which is responsible for the formation of delta at a place where rivers meet the sea is$ (1) $peptization$ (2) $colloidal formation$ (3) $emulsification$ (4) $coagulation.$ 227. $Which one of the following is not an emulsion?$ (1) $Milk$ (2) $Soap lather$ (3) $Butter$ (4) $Vanishing cream$ 228. $For Freundlich adsorption isotherm, a graph of log (x / m) us. log (P) gives a straight line. The slope of line and its Y -axis intercept respectively are$ (1) $log (\frac{1}{n}), K$ (2) $\frac{1}{n}, log K$ (3) $log (\frac{1}{n}), log K$ (4) $\frac{1}{n}, K$ 229. $The process in which colloids, when subjected to DC electric field move towards an electrode is$ (1) $Brownian movement$ (2) $Tyndall effect$ (3) $Peptization$ (4) $Electrophoresis$ 230. $A plot of log (x / m) versus log (p) for adsorption of a gas on a solid gives a straight line with a slope of$ (1) $- log k$ (2) $log (1/ n)$ (3) $\frac{1}{n}$ (4) $antilog (1/ n)$ 231. $Which of the following colloids is not a gel?$ (1) $Cheese$ (2) $Butter$ (3) $Milk$ (4) $Jellies$ 232. $When FeCl_{3} is added to excess of hot water gives a sol ' X'. When FeCl_{3} is added to NaOH_{(aq)} solution, gives sol ' Y'. X and Y formed in the above processes respectively are$ (1) $Fe2O3\cdotxH2O/OH-and Fe_{2} O_{3} \cdot x H_{2} O / Fe^{3 +}$ (2) $Fe_{2} O_{3} \cdot x H_{2} O / H^{+} and Fe_{2} O_{3} \cdot x H_{2} O / Na^{+}$ (3) $Fe_{2} O_{3} \cdot x H_{2} O / Cl^{-} and Fe_{2} O_{3} \cdot x H_{2} O / OH^{-}$ (4) $Fe_{2} O_{3} \cdot x H_{2} O / Fe^{3 +} and Fe_{2} O_{3} \cdot x H_{2} O / OH^{-}$ 233. $Given Gas H_{2} C H_{4} C O_{2} S O_{2} Critical 33 190 304 630 Temperature / K On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal?$ (1) $C H_{4}$ (2) $H_{2}$ (3) $C O_{2}$ (4) $S O_{2}$ 234. $Which one of the following enzymes converts proteins into amino acids?$ (1) $Maltase$ (2) $Pepsin$ (3) $Trypsin$ (4) $Zymase$ 235. $Which of the following does not show Tyndall effect?$ (1) $Clouds$ (2) $Milk$ (3) $Sugar solution$ (4) $Suspension$ 236. $The enzyme which converts maltose to glucose is$ (1) $maltase$ (2) $lysine$ (3) $insulin$ (4) $zymase.$ 237. $The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called$ (1) $maltase$ (2) $lipase$ (3) $zymase$ (4) $pepsin.$ 238. $Which one of the following forms micelles in aqueous solution above certain concentration?$ (1) $Dodecyl trimethyl ammonium chloride$ (2) $Glucose$ (3) $Urea$ (4) $Pyridinium chloride$ 239. $100ml of 0.0018%(w/v) solution of C l^{-} ion was the minimum concentration of C l^{-} required to precipitate a negative sol in one h. The coagulating value of C l^{-} ion is ___ (Nearest integer)$ 240. $C O_{2} gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of C O_{2} adsorbed becomes 64 times when the pressure of C O_{2} is doubled. The value of n in the Freundlich isotherm equation is ___\times 1 0^{- 2} . (Round off to the Nearest Integer)$