A device that converts energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as : 

1. Fuel cell
2. Electrolytic cell
3. Dynamo
4. Ni-Cd cell

Subtopic:  Batteries & Salt Bridge |
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When 0.1 mol MnO42- is oxidized the quantity of electricity required to completely oxidise MnO42--  to MnO4- is : 

1. 96500 C

2. 2 x 96500 C

3. 9650 C

4. 96.50 C

Subtopic:  Faraday’s Law of Electrolysis |
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The weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of Oat STP will be :

1. 5.4 g

2. 10.8 g

3. 54.0 g

4. 108.0 g

Subtopic:  Faraday’s Law of Electrolysis |
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A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be : 

1. 0.59 V
2. 0.118 V
3. 1.18 V
4. 0.059 V

Subtopic:  Relation between Emf, G, Kc & pH |
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At 25 ºC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm–1cm2 mol–1 and at infinite dilution, its molar conductance is 238 ohm–1 cm2 mol–1. The degree of ionization of ammonium hydroxide at the same concentration and temperature is :
 
1. 20.800%
 
2. 4.008%
 
3. 40.800%
 
4. 2.080%
Subtopic:   Kohlrausch Law & Cell Constant |
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A button cell used in watches functions as following 
Zn(s) + Ag2O(s) + H2O(l) \(\rightleftharpoons\) 2Ag(s) + Zn2+(aq) + 2OH(aq)

If half-cell potentials are:

Zn2+(aq) + 2e→ Zn(s)  Eo = – 0.76 V 
Ag2O(s) + H2O(l) + 2e → 2Ag(s) + 2OH(aq) Eo = 0.34 V

The cell potential will be:

1. 0.42 V

2. 0.84 V

3. 1.34 V

4. 1.10 V

Subtopic:  Electrode & Electrode Potential |
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Limiting molar conductivity of NH4OH (i.e., ΛmNH4OH0 is equal to -

1. ΛmNaOH0+ΛmNaCl0-ΛmNaOH0

2. ΛmNaOH0+ΛmNaCl0-ΛmNH4Cl0

3. ΛmNH4OH0+ΛmNH4Cl0-ΛmHCl0

4. ΛmNH4Cl0+ΛmNaOH0-ΛmNaCl0

Subtopic:   Kohlrausch Law & Cell Constant |
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The Gibb's energy for the decomposition of Al2O3 at 500°C is as follows: 

2/3Al2O3 → 4/3Al + O2 ; ∆rG = + 960 k J mol-1

The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at 500°C is at least,

1. 3.0 V 

2. 2.5 V 

3. 5.0 V 

4. 4.5 V 

Subtopic:  Relation between Emf, G, Kc & pH |
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Molar conductivities (°m) at infinite dilution of NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol-1 respectively. (°m)  for CH3COOH  will be:

1.  180.5 S cmmol-1

2.  290.8 S cmmol-1

3.  390.5 S cmmol-1

4.  425.5  S cmmol-1

Subtopic:   Kohlrausch Law & Cell Constant |
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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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