A device that converts the 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 |
 83%
From NCERT
NEET - 2015
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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 |
 77%
From NCERT
AIPMT - 2014
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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 |
 55%
From NCERT
AIPMT - 2014
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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 the 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 |
 74%
From NCERT
AIPMT - 2013
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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 are:
1. 20.800%
2. 4.008%
3. 40.800%
4. 2.080%
Subtopic:   Kohlrausch Law & Cell Constant |
 82%
From NCERT
AIPMT - 2013
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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 |
 86%
From NCERT
AIPMT - 2013
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Consider the half-cell reduction reaction:
\(Mn^{2+}+2e^{-}\) \(\rightarrow\) \(Mn,\ E^{0}=\ -1.18\ V \)
\(Mn^{2+}\rightarrow Mn^{3+}+e^{-},\ E^{0}=\ -1.51\ V\)
The \(E^{0}\) for the reaction \(3\ Mn^{2+}\rightarrow Mn^{0}+2Mn^{3+} \) and possibility of the forward reaction is respectively:
1. – 4.18 V and yes 2. + 0.33 V and yes
3. + 2.69 V and no 4. – 2.69 V and no
Subtopic:  Electrode & Electrode Potential |
 52%
From NCERT
NEET - 2013
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How many grams of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes?
(1 Faraday = 96,500 C; Atomic mass of Co = 59 u):
1. 4.0 2. 20.0
3. 40.0 4. 0.66
Subtopic:  Faraday’s Law of Electrolysis |
 70%
From NCERT
NEET - 2013
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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 |
 90%
From NCERT
AIPMT - 2012
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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 |
 60%
From NCERT
AIPMT - 2012
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