Surface Chemistry PYQs Set 5 (PDF)

Set 5 of 8 · Questions 121-150 of 227

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NEET Chemistry · Surface Chemistry · Set 5 (Q121-150)

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121.
Which one of the following statement is not correct?
1. (1) $A mixture of dinitrogen and dioxygen at room temperature is an example for aerosol$
2. (2) $Lyophilic sols are more stable compared to lyophobic sols$
3. (3) $Formation of micelles is possible only above Kraft temperature$
4. (4) $An example for a soap is sodium stearate and an example for detergent is sodium lauryl sulphate$
122.
The volume of collodial particle $V_{C}$ as compared to the volume of a solute particle in a true solution $V_{S}$ could be:
1. (1) $\sim 1$
2. (2) $\sim 10^{23}$
3. (3) $\sim 10^{- 3}$
4. (4) $\sim 10^{3}$
123.
$10 g$ of a gas is adsorbed on $500 g$ of solid at $10 bar$ . If the pressure is increased at $20 bar, 14 g$ of the gas is adsorbed by the same solid at the same temperature. What is the slope of Freundlich adsorption isotherm?
1. (1) $1.0$
2. (2) $\frac{4}{3}$
3. (3) $3$
4. (4) $0.5$
124.
Amongst the following statements regarding adsorption, those that are valid are:
(A) Ali becomes less negative as adsorption proceeds
(B) On a given adsorbent, ammonia is adsorbed more than nitrogen gas
(C) On adsorption, the residual force acting along the surface of the adsorbent increases
(D) With increase in temperature, the equilibrium concentration of adsorbate increases
1. (1) $(C) and (D)$
2. (2) $(A) and (B)$
3. (3) $(D) and (A)$
4. (4) $(b) and (c)$
125.
Which of the following is not correctly matched for enzymatic reactions?
1. (1) $Proteins \to Amino acids ; Trypsin$
2. (2) $Starch \to Maltose; Diastase$
3. (3) $Sucrose \to glucose and fructose; zymase$
4. (4) $Maltose \to glucose; Maltase$
126.
Which of the following statements is incorrect regarding physissorptions?
1. (1) $More easily liquefiable gases are adsorbed readily.$
2. (2) $Under high pressure it results into multi molecular layer on adsorbent surface.$
3. (3) $Enthalpy of adsorption (Δ H_{adsorption}) is low and positive.$
4. (4) $It occurs because of van der Waal's forces.$
127.
In the reaction, $H_{2} O_{2 (aq)} \to I - (aq) H_{2} O_{(l)} + \frac{1}{2} O_{2 (g)}$ iodide ion acts as
1. (1) $homogeneous catalyst$
2. (2) $acid catalyst$
3. (3) $heterogeneous catalyst$
4. (4) $enzyme catalyst.$
128.
Which of the following is an example of homogeneous catalysis?
1. (1) $Oxidation of NH_{3} in Ostwald's process$
2. (2) $Oxidation of SO_{2} in contact process$
3. (3) $Oxidation of SO_{2} in lead chamber process$
4. (4) $Manufacture of NH_{3} by Haber's process$
129.
Which one of the following is used in the hardening of leather?
1. (1) $Light sensitive silver bromide in gelatin$
2. (2) $Sodium lauryl sulphate$
3. (3) $Alum$
4. (4) $Tannin$
130.
The correct option among the following is:
1. (1) $Colloidal medicines are more effective because they have small surface area$
2. (2) $Addition of alum of water makes it unit for drinking$
3. (3) $Colloidalparticles in lyophobic sols can be precipitated by electrophoresis$
4. (4) $Brownian motion in colloidal solution is faster the viscosity of the solution is very high.$
131.
$Match List-I with List-II$
$List-I$ $List-II$
$(A) Lyophilic colloid$ $(I) Liquid-liquid colloid$
$(B) Emulsion$ $(II) protective colloid$
$(C) Positively charged$ $(III) F e C l_{3} + NaOH$
$(D) Negatively charged$ $(IV) F e C l_{3} + hot water colloid$
$Choose the correct answer from the options given below:$
1. (1) $(A) - (II), (B) - (I), (C) - (IV), (D) - (III)$
2. (2) $(A) - (III), (B) - (I), (C) - (IV), (D) - (II)$
3. (3) $(A) - (II), (B) - (I), (C) - (III), (D) - (IV)$
4. (4) $(A) - (III), (B) - (II), (C) - (I), (D) - (IV)$
132.
A plot of $\frac{1}{T} vsk$ for a reaction gives the slope $- 1 \times 10^{4} K$ . The energy of activation for the reaction is (Given : $R = 8.314 J K^{- 1} mol^{- 1}$ )
1. (1) $8314 J mol^{- 1}$
2. (2) $1.202 kJ mol^{- 1}$
3. (3) $12.02 J mol^{- 1}$
4. (4) $83.14 kJ mol^{- 1}$
133.
The ability of anion, to bring about coagulation of a given colloid, depends upon
1. (1) $magnitude of the charge$
2. (2) $both magnitude and charge$
3. (3) $its charge only$
4. (4) $sign of the charge alone.$
134.
The auto catalyst in the redox reaction involving acidified potassium permanganate and oxalic acid is
1. (1) $Mn^{2 +}$
2. (2) $SO_{4}^{2 -}$
3. (3) $CO_{2}$
4. (4) $H_{2} O$
135.
Most suitable salt which can be used for efficient clotting of blood will be :
1. (1) $Mg (HC O_{3})_{2}$
2. (2) $FeS O_{4}$
3. (3) $NaHC O_{3}$
4. (4) $FeC l_{3}$
136.
The aerosol is a kind of colloid in which:
1. (1) $solid is dispersed in gas$
2. (2) $gas is dispersed in solid$
3. (3) $gas is dispersed in liquid$
4. (4) $liquid is dispersed in water$
137.
Identify the factors which favour the physical adsorption from the following.
(I) High surface area
(II) Low temperatures
(III)High temperatures
(IV) Low pressures
(V) High pressures
1. (1) $I, III & IV only$
2. (2) $I, II & V only$
3. (3) $III & V only$
4. (4) $I, II & IV only$
138.
Position ofnon polar and polar part in micelle
1. (1) $polar at outer surface but non polar at inner surface$
2. (2) $polar at inner surface non polar at outer surface$
3. (3) $distributed over all the surface$
4. (4) $are present in the surface only$
139.
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. (1) $\infty$
2. (2) $1$
3. (3) $zero$
4. (4) $\frac{1}{n}$
140.
During the action of enzyme 'zymase' glucose is converted into……… with the liberation of carbon dioxide gas.
1. (1) $phenol$
2. (2) $ethanol$
3. (3) $methanol$
4. (4) $isopropyl alcohol$
141.
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 used
The correct statements are
1. (1) $I & IIi only$
2. (2) $II & III only$
3. (3) $I, II & III$
4. (4) $I & II only$
142.
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. (1) $Both (a) and (R) are correct and (R) is the correct explanation of (a)$
2. (2) $Both (a) and (R) are correct but (R) is not the correct explanation of (a)$
3. (3) $(a) is correct but (R) is not correct$
4. (4) $(a) is not correct but (R) is correct$
143.
Which of the following is not the application of adsorption?
1. (1) $Use of SiO_{2} gel for removing the moisture$
2. (2) $Use of coconut charcoal to separate inert gases$
3. (3) $Use of Al_{2} O_{3} to separate the components of organic mixture in chromatography$
4. (4) $Use of CaCl_{2} for removing the moisture$
144.
The charges on the colloidal $CdS$ sol and $TiO_{2}$ sol are, respectively:
1. (1) $positive and positive$
2. (2) $positive and negative$
3. (3) $negative and negative$
4. (4) $negative and positive$
145.
Curdling of milk is caused due to the formation of which of the following acids by the bacteria?
1. (1) $Formic acid$
2. (2) $Acetic acid$
3. (3) $Lactic acid$
4. (4) $Maleic acid$
146.
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. (1) $T_{4} > T_{2} > T_{3}$
2. (2) $T_{4} > T_{3} > T_{2}$
3. (3) $T_{2} > T_{3} > T_{4}$
4. (4) $T_{2} > T_{4} > T_{3}$
147.
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. (1) $0.3 and log 2.505$
2. (2) $0.3 and 0.7033$
3. (3) $3 and 2.505$
4. (4) $3 and 0.7033$
148.
With respect to drug-enzyme interaction, identify the wrong statement:
1. (1) $Non-Competitive inhibitor binds to the allosteric site$
2. (2) $Allosteric inhibitor changes the enzyme's active site$
3. (3) $Allosteric inhibitor competes with the enzyme's active site$
4. (4) $Competitive inhibitor binds to the enzyme's active site$
149.
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. (1) $p^{2}$
2. (2) $p$
3. (3) $p^{1/2}$
4. (4) $p^{1/4}$
150.
Which of the following options are correct?
1. (1) $A and C represent physisorption$
2. (2) $A and D represent physisorption$
3. (3) $A and C represent chemisorption$
4. (4) $B and C represent chemisorption$