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BITSAT 2019 Physical Chemistry Revision Quiz 4

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Question 1

8 mol of AB3(g) are introduced into a 1.0 dm3 vessel. If it dissociates as 2AB3(g) A2(g) + 3B2(g). At equilibrium, 2 mol of A2 are found to be present. The equilibrium constant of this reaction is

Question 2

Given

i. HCN(aq) + H2O(l) H3O+(aq) + CN-(aq) Ka = 6.2 × 10-10

ii. CN-(aq) + H2O(l) HCN(aq) + OH-(aq) Kb = 1.6 × 10-5

These equilibria show the following order of the relative base strength,

Question 3

K1, K2 and K3 are the equilibrium constants of the following reactions (I), (II) and (III) respectively:

(I) N2+2O22NO2

(II) 2NO2N2+2O2

(III) NO21/2N2+O2

The correct relation from the following is

Question 4

The standard emf of the cell, Cd (s) | CdCl2(aq) | | AgCl(s) | Ag(s) in which the cell reaction is, Cd(s)+2AgCl(s) 2Ag(s) + Cd+2(aq)+2Cl(aq) is 0.6915 V at 0 ºC and 0.6753 V at 25 º C. The ΔH of the reaction at 25 ºC is -

Question 5

In an experiment 50 ml. of 0.1 (M) solution of a salt reacted with 25 ml. of 0.1 (M) solution of sodium sulphite. The half equation for the oxidation of sulphit ion is -
(aq) + H2O (η)
(aq) + 2H+ (aq) + 2e
If the oxidation number of metal in the salt was 3, what would be the new oxidation number of metal?

Question 6

50 ml of 0.5M CH3COOH is adsorbed by 2 g of activated carbon of surface area 2 × 102. After adsorption molarity becomes 0.48M. Find the surface area of charcoal covered by single molecule of acetic acid.

Question 7

A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl2 and AlCl3 solutions. Their co-agulating power should be–
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Sep 18JEE & BITSAT