Saturday, October 10, 2009

IIT-JEE-Chemistry-Final Revision Set No.85

A 4.0 molar aqueous solution of NaCI is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass: Na = 23, Hg = 200; 1 Faraday = 96500 coulombs).

1. The total number of moles of chlorine gas evolved is

(A) 0.5

(B) 1.0

(C) 2.0

(D) 3.0

2. If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is

(A) 200

(B) 225

(C) 400

(D) 446

3. The total charge (coulombs required for complete electrolysis is

(A) 24125

(B) 48250

(C) 96500

(D) 19300

4. Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

(A) 3

(B) 4

(C) 5

(D) 6

5. Among the following metal carbonyls, the C-O bond order is lowest in

(A) [Mn(CO)6]+

(B) [Fe(CO)5]

(C) [Cr(CO)6]

(D) [V(CO)6]-

Source: 2007 JEE paper 2

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