1.A solution of copper sulphate is to be stored in a container made of a metal. Which of the following metals is/are suitable for this purpose?
(i) silver
(ii) lead
(iii) zinc
(The standard electrode potentials for Cu²⁺, Ag⁺, Pb²⁺ and Zn²⁺ are 0.34V, 0.80V, -0.13V and -0.76V, respectively.)
(A) (i) only
(B) (ii) and (iii)
(C) (i) and (ii)
(D) (i) ,(ii) and (iii)

Ans: (A) (i) only

2.The reaction Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s) at 300 K has Eocell = 1.2V.
The equilibrium constant for this reaction is (2.303 RT/F = 0.06V)
(A) 40
(B) 10¹⁰
(C) 10²⁰
(D) 10⁴⁰

Ans: (D) 10⁴⁰

3.The potential of hydrogen electrode corresponding to the reaction
H⁺(aq) + e^- → ½ H₂(g) in contact with a solution of pH = 9 is
(given the pressure of H₂ gas is 1 bar and 2.303 RT/F = 0.06 V)
The equilibrium constant for this reaction is (2.303 RT/F = 0.06V)
(A) -0.54 V
(B) 0 V
(C) 0.27 V
(D) 1.08 V

Ans: (A) -0.54 V

4.If the distance between Na⁺ and Cl^- ions in sodium chloride crystal is X pm, the length of the edge of the unit cell is:
(A) X/2 pm
(B) 2X pm
(C) 4X pm
(D) X/4 pm

Ans: (B) 2X pm

5.Aluminium displaces hydrogen from dilute HCl whereas silver does not. The E.M.F of a cell prepared by combining Al|Al⁺³ and Ag|Ag⁺ is 2.46 V.The reduction potential of silver electrode is +0.80V.The reduction potential of aluminium electrode is:
(A) 3.26 V
(B) -1.66 V
(C) +1.66 V
(D) -3.26 V

Ans: (B) -1.66 V

6.The hydrogen electrode is dipped in a solution of pH 3 at 25^oC .The potential would be (the value of 2.303 RT/F is 0.059 V)
(A) 0.177 V
(B) 0.087 V
(C) 0.059 V
(D) -0.177V

Ans: (B) 0.087 V

7. How long it will take for the deposition of 0.2g of silver when silver nitrate solution is electrolysed using 0.5 ampere of current (Mol mass of Ag = 10⁸)
(A) 357.4 seconds
(B) 234.4 seconds
(C) 120 seconds
(D) 180.5 seconds

Ans: (A) 357.4 seconds

8.Given : E^o_{Mn⁺⁷|Mn⁺²} = 1.5 V and E^o_{Mn⁺⁴|Mn⁺²} = 1.2 V , then E^o_{Mn⁺⁷|Mn⁺⁴} is
(A) 0.3 V
(B) 1.7 V
(C) 0.1 V
(D) 2.1 V

Ans: (B) 1.7 V

9.For a cell reaction involving two electron changes, E^o_cell = 0.3 V at 25^oC . The equilibrium constant of the reaction is :
(A) 10^-10
(B) 3 x 10^-2
(C) 10
(D) 10¹⁰

Ans: (D) 10¹⁰

10.The products of hydrogen fuel cell are:
(A) smoke and carbon dioxide
(B) hydrogen and oxygen
(C) hydrogen and electricity
(D) water and electricity

Ans: (D) water and electricity

11.The electrical resistance of a column of 0.1 mol L^-1 KOH solution of area 10 cm² and length 50cm is 5 x 10³ Ω.The molar conductivity of the solution is :
(A) 0.01 S cm² mol^-1
(B) 0.1 S cm² mol^-1
(C) 5 S cm² mol^-1
(D) 10 S cm² mol^-1

Ans: (D) 10 S cm² mol^-1