The metal that cannot be produced upon reduction of its oxide by aluminium is :

1. K 2. Mn
3. Cr 4. Fe

Subtopic:  Electrode & Electrode Potential |
 72%
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Adiponitrile is manufactured electrolytically from acrylonitrile. The reaction is as follows:
CH2= CHCN  CN  (CH2 )4  CN

How many kg of adiponitrile (molecular mass = 108) is produced in 9.65 hr using a current of 3750 A with 80 % efficiency?

1. 30 kg                                               

2. 58 kg

3. 60 kg                                               

4. 80 kg

Subtopic:  Faraday’s Law of Electrolysis |
 61%
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The useful work of the reaction \(\small{\mathrm{Ag}(\mathrm{s})+1 / 2 \mathrm{Cl}_2(\mathrm{~g}) \rightarrow \mathrm{AgCl}(\mathrm{s})}\) is: 

Given,
\(E_{Cl_{2}/Cl^{-}}^{o} \ = \ +1.36 \ V, \)
\(E_{AgCl/Ag, / Cl^{-}}^{o} \ = \ 0.22 \ V, \)
\( P_{Cl_{2}} \ = \ 1 \ atm\ and \)
\( T = 298 K\)

1. -110 kJ/mol 2. 220 kJ/mol
3. 55 kJ/mol 4. 1000 kJ/mol
Subtopic:  Relation between Emf, G, Kc & pH |
 66%
From NCERT
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Given the following cell:

\(\small{Pt(s)|Br_{2}(l)|Br^{-}(0.010 \ M)\ || H_{2}(g)(1\ bar)|H^{+}(0.030 \ M)|Pt(s)}\)

If the concentration of \(Br^-\) becomes 2 times and the concentration of \(H^+\) becomes half of the initial value, then emf of the cell will become:

1. Two times.

2. Four times.

3. Eight times.

4. Remains the same.

Subtopic:  Nernst Equation |
 52%
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The unit of specific conductance is:

1. ohm-1 cm-1 2. ohm cm
3. ohm cm-1 4. ohm-1 cm
Subtopic:  Conductance & Conductivity |
 82%
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For the cell, Ti/Ti+(0.001M)||Cu2+(0.1M)|Cu, Ecello 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 the above.

Subtopic:  Nernst Equation | Faraday’s Law of Electrolysis |
 71%
From NCERT
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The specific conductance of a 0.1 M KCl solution at 23°C is 0.012 Ω-1cm-1.
The resistance of the cell containing the solution at the same temperature
was found to be 55 Ω. The cell constant will be:

1. 0.142 cm-1
2. 0.66 cm-1
3. 0.918 cm-1
4. 1.12 cm-1

Subtopic:  Conductance & Conductivity |
 89%
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Aluminium oxide may be electrolysed at 1000 C to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is: Al3++3e-Al

To prepare 5.12 kg of aluminium metal by this method, would require : 

1. 5.49×10C of electricity 

2. 1.83×10C of electricity

3. 5.49×10C of electricity 

4. 5.49×10C of electricity

Subtopic:  Faraday’s Law of Electrolysis |
 61%
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The specific conductance of 0.01 M solution of a weak monobasic acid is 0.20 x 10-3 S cm-1. The dissociation constant of the acid is-

[Given  ΛHA = 400 S cm2 mol-1]

1. \(5 \times 10^{-2}\) 2. \(2.5 \times 10^{-5}\)
3. \(5 \times 10^{-4}\) 4. \(2.2 \times 10^{-11}\)
Subtopic:  Conductance & Conductivity |
 56%
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The equilibrium constant of a 2 electron redox reaction at 298 K is 3.8 x 10-3. The cell potential Eo (in V) and the free energy change ∆Go (in kJ mol-1 ) for this equilibrium respectively, are -

1. -0.071, -13.8 2. -0.071, 13.8
3. 0.71, -13.8 4. 0.071, -13.8
Subtopic:  Relation between Emf, G, Kc & pH |
 62%
From NCERT
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