A depolariser used in dry cell batteries is: 

1. Ammonium chloride 

2. Manganese dioxide

3. Potassium hydroxide 

4. Sodium phosphate

Subtopic:  Batteries & Salt Bridge |
 51%
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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%
From NCERT
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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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A hydrogen gas electrode is made by dipping platinum wire in a solution of HCI of pH = 10 and by passing hydrogen gas around the platinum wire at 1 atm pressure. The oxidation potential of the electrode would be:

1. 0.059 V
2. 0.59 V
3. 00.118 V
4. 1.18 V

Subtopic:  Electrode & Electrode Potential |
 77%
From NCERT
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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 |
 59%
From NCERT
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Which one of the following pairs of substances on reaction will not evolve H2 gas?

1. Iron and H2SO4 (aq)

2. iron and steam

3. Copper and HCl(aq)

4. Sodium and ethyl alcohol

Subtopic:  Preparation & Properties |
 65%
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A certain current liberates 0.504 g of hydrogen in 2 hr. How many gram of copper can be liberated by the same current flowing for the same time in CuSO4 solution?

1. 12.7

2. 16

3. 31.8

4. 63.5

Subtopic:  Faraday’s Law of Electrolysis |
 67%
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For the reductidon of silver ions with copper metal, the standard  cell potential was found to be + 0.46 V at 250C. The value of standard Gibbs energy(G0) will be ;
(F = 96500 Cmol-1)

1. -89.0 KJ

2. -89.0 J

3. -44.5 KJ

4. -98.0 KJ

Subtopic:  Relation between Emf, G, Kc & pH |
 70%
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A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively:

1. H2, O2

2. O2, H2

3. O2, Na

4. O2, SO2

Subtopic:  Electrolytic & Electrochemical Cell |
 75%
From NCERT
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If a salt bridge is removed from the two half cells, the voltage:

1. Drops to zero.

2. Does not change.

3. Increases gradually.

4. Increases rapidly.

Subtopic:  Batteries & Salt Bridge |
 76%
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