Standard electrode potential of three metals X, Y and Z are -1.2 V, +0.5 V and -3.0 V respectively. The reducing power of these metals will be : 

1.  Y > X > Z

2.  Z > X > Y

3.  X > Y > Z

4.  Y > Z > X

Subtopic:  Electrode & Electrode Potential |
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If the  Ecell 0for a given reaction has a negative value, then which of the following gives the correct relationship for the values of G0  and   Keq?

1.  G0<0; Keq>1

2.  G0<0; Keq<1

3.  G0>0; Keq<1

4.  G0>0; Keq>1

Subtopic:  Electrolytic & Electrochemical Cell | Relation between Emf, G, Kc & pH |
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Based on electrode potentials in the table below: 
Cu2+(aq) + e- → Cu+(aq) 0.15 V
Cu+(aq) + e- → Cu(s) 0.50 V

The value of \(E_{Cu^{2+}/Cu}^{o}\) will be:
1. 0.325 V
2. 0650 V
3. 0.150 V
4. 0.500 V

 
Subtopic:  Electrode & Electrode Potential |
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Standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for Cr3+/Cr couple is -0.74. 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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In producing chlorine by electrolysis, 100 kW power at 125 V is being consumed. How much chlorine per minute is liberated (ECE of chlorine is 0.367 X 10-6 kgC-1)

1.1.76×10-3 kg

2. 9.67×10-3 kg

3. 17.61×10-3 kg

4. 3.67×10-3 kg

Subtopic:  Faraday’s Law of Electrolysis |
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For the reduction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25 °C. The value of standard Gibbs energy, ΔGo will be : 

(F = 96500 C mol-1)

1. -89.0 kJ

2. -89.0 J

3. -44.5 kJ

4. -98.0 kJ

Subtopic:  Faraday’s Law of Electrolysis |
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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% ionization of electrolyte at normal dilution

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

4. increase in the number of ions

Subtopic:  Conductance & Conductivity |
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Al2Ois reduced by electrolysis at low potentials and high currents. If 4.0 x 10A of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced ?

(Assume 100 % current efficiency, atomic mass of Al = 27 g mol-1)

1. 9.0 x 103 g

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 molar conductance of M32 solution of a weak monobasic acid is 8.0 ohm-1 cmand at infinite dilution is 400 ohm-1 cm2. The dissociation constant of this acid is : 

1. 1.25×10-5

2. 1.25×10-6

3. 6.25×10-4

4. 1.25×10-4

Subtopic:   Kohlrausch Law & Cell Constant |
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Given, 
(i) Cu2++2e-Cu    Eo = 0.337 V 
(ii) Cu2++e-Cu+  Eo = 0.153 V 
Electrode potential, Eo for the reaction, 
Cu++e-Cu, will be : 

1. 0.52 V

2. 0.90 V

3. 0.30 V

4. 0.38 V

Subtopic:  Relation between Emf, G, Kc & pH |
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