The ratio of masses of hydrogen and magnesium deposited by the same amount of electricity from H2SO4 and MgSO4 in aqueous solution are:

1. 1:8

2. 1:12

3. 1:16

4. none of these

Subtopic:  Faraday’s Law of Electrolysis |
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The molar conductances of Ba2+ and Cl- 127 and 76Ω-1 cm-1 mol-1 respectively at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be

1. 139.52

2. 203

3. 279

4. 101.5

Subtopic:   Kohlrausch Law & Cell Constant |
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A depolariser used in dry cell batteries is: 

1. Ammonium chloride 

2. Manganese dioxide

3. Potassium hydroxide 

4. Sodium phosphate

Subtopic:  Batteries & Salt Bridge |
 52%
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The reaction taking place  at anode when an aqueous solution of CuSO4 is electrolysed using inert Pt electrode:

1. 2SO42-  S2O32- + 2e

2. Cu2+ + 2e Cu

3. 2H2 O2 + 4H+ + 4e

4. 2H+ +2e  H2

Subtopic:  Electrode & Electrode Potential |
 67%
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An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

1. increase in ionic mobility of ions

2. 100% ionisation of electrolyte at normal dilution

3. increase in both, i.e. number of ions and ionic mobility of ions

4. increase in number of ions

Subtopic:   Kohlrausch Law & Cell Constant |
 55%
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For the cell, Ti|Ti+(0.001M)||Cu2+(0.1M)|Cu,Ecell at 25°C is 0.83 V. Ecell can be increased:

1. By increasing [Cu2+]

2. By increasing [Ti+]

3. By decreasing [Cu2+]

4. None of these

Subtopic:  Nernst Equation |
 69%
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The atomic mass of Al is 27. When a current of 5 faraday is passed through a solution of Al3+ ions, the mass of Al deposited is:

1. 27 g

2. 36 g

3. 45 g

4. 9 g

Subtopic:  Faraday’s Law of Electrolysis |
 85%
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Cu+(aq) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction 

2Cu+(aq) Cu2+(aq) + Cu(s)

Choose the correct E0 for above reaction if E0cu2+/cu = 0.34 V and E0cu2+/cu+ = 0.15 V 

1. -0.38 V

2. +4.9 V

3. +0.38 V

4. -0.19 V

Subtopic:  Relation between Emf, G, Kc & pH |
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On the basis of the information available from the reaction.

43Al + O2           23Al2O3, G =-827kJ mol-1 

of O2, the minimum EMF required to carry out the electrolysis of Al2O3 is : (F=96500 C mol-1

1. 2.14 V

2. 4.28 V

3. 6.42 V

4. 8.56 V

Subtopic:  Faraday’s Law of Electrolysis |
 63%
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4.5 g of aluminium (atomic mass 27u) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be

1. 44.8 L

2. 22.4 L

3. 11.2 L

4. 5.6 L

Subtopic:  Faraday’s Law of Electrolysis |
 58%
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