The voltage of the cell given below increases due to: 

Cell: Sn(s) + 2Ag+(aq) → Sn2+(aq) + 2Ag(s)

1. Increase in size of the silver rod.

2. Increase in the concentration of Sn2+ ions.

3. Increase in the concentration of Ag+ ions.

4. None of the above.

Subtopic:  Nernst Equation |
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A 5A current is passed through a solution of copper sulphate for 40 min. The amount of copper deposited at the cathode is 

1. 40.65g

2. 0.45g

3. 3.94g

4. 65.04g

Subtopic:  Faraday’s Law of Electrolysis |
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EFe2+Fe = -0.441 V and EFe3+Fe2+ =0.771 V, the standard emf of the reaction

Fe + 2Fe3+          3Fe2+will be

1. 0.111V

2. 0.330V

3. 1.653V

4. 1.212V

Subtopic:  Electrode & Electrode Potential |
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The standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is -0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be: 

1. +0.89 V

2. +0.18 V

3. +1.83 V

4. +1.199 V

Subtopic:  Electrode & Electrode Potential |
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If an iron rod is dipped in CuSO4 solution, then:

1. Blue colour of the solution turns red.

2. Brown layer is deposited on iron rod.

3. No change occurs in the colour of the solution.

4. None of the above.

Subtopic:  Electrochemical Series |
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Without losing it's concentration, ZnCl2 solution cannot be kept in contact with :

1. Au

2. Al

3. Pb

4. Ag

Subtopic:  Electrochemical Series |
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Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 x 104 A of current is passed through molten Al2O3 for 6 h, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27g mol-1)

1. 9.0 x 103

2.  8.1 x 104 g

3.  2.4 x 105 g

4.  1.3 x 104 g

Subtopic:  Faraday’s Law of Electrolysis |
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The standard reduction potential at 290 K for the following half reactions are,

(i) Zn2+ + 2e— → Zn(s);      E° = -0.762 V

(ii) Cr3+ + 3e → Cr(s);          E° = -0.740 V

(iii) 2H+ + 2e → H2(g); ·      E° = +0.000 V

(iv) Fe3+ + e → Fe2+;         E° = +0.77V

Which is the strongest reducing agent?

1. Zn

2. Cr

3. Fe2+

4. H2

Subtopic:  Electrode & Electrode Potential |
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Which graph correctly correlates Ecell as a function of concentrations for the cell (for different values of M and M') ?

Zn(s) + Cu2+(M)           Zn2+(M') + Cu(s);                Ecell = 1.10 VX-axis : log10Zn2+Cu2+, Y-axis : Ecell 

1.                         2. 
3.                         4. 

Subtopic:  Nernst Equation |
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The most convenient method to protect the bottom of the ship made of iron is 

1. coating it with red lead oxide

2. white tin plating 

3. connecting it with Mg block

4. connecting it with Pb block

Subtopic:  Corrosion |
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