The mass of silver(eq. mass = 108) displaced by that quantity of current which displaced 5600 mL of hydrogen at STP is:

1. 54 g

2. 108 g

3. 5.4 g

4. none of these

Subtopic:  Faraday’s Law of Electrolysis |
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A silver cup is plated with silver by passing 965 coulomb of electricity. The amount of Ag deposited is:

1. 1.08 g

2. 1.0002 g

3. 9.89 g

4. 107.89 g

 

Subtopic:  Faraday’s Law of Electrolysis |
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Which is the correct representation for Nernst equation ?

1. \(E_{\mathrm{RP}}=E_{\mathrm{RP}}^{\circ}+\frac{0.059}{\mathrm{n}} \log \frac{[\text { oxidant }]}{[\text { reductant }]}\)

2. \(E_{\mathrm{OP}}=E_{\mathrm{OP}}^{\circ}-\frac{0.059}{\mathrm{n}} \log \frac{[\text { oxidant }]}{[\text { reductant }]}\)

3. \(E_{\mathrm{OP}}=E_{\mathrm{OP}}^{\circ}+\frac{0.059}{\mathrm{n}} \log \frac{[\text { reductant }]}{[\text { oxidant }]}\)

4. All of the above

Subtopic:  Nernst Equation |
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When a copper wire is immersed in a solution of AgNO3, the colour of the solution becomes blue because copper:

1. Forms a soluble complex with \(AgNO_3\)
2. Is oxidised to \(Cu^{2+}\)
3. Is reduced to \(Cu^{2-}\)
4. Splits up into atomic form and dissolves

Subtopic:  Electrochemical Series |
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The specific conductance of a 0.1N KCl solution at 23°C is 0.012 Ω-1cm-1. The resistance of cell containing the solution at the same temperature was found to be 55 Ω. The cell constant will be 
1. 0.142cm-1

2. 0.66 cm-1

3. 0.918 cm-1

4. 1.12cm-1

Subtopic:  Conductance & Conductivity |
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Given below are the half-cell reactions,

Mn2+ + 2e-  

Mn will be:

Subtopic:  Electrode & Electrode Potential |
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E0 for Fe2+ + 2e → Fe is -0.44 volt and E0 for Zn2+ + 2e→ Zn is -0.76 volt, thus:

1. Zn is more electropositive than Fe

2. Fe is more electropositive than Zn

3. Zn is more electronegative

4. none of the above  

Subtopic:  Electrode & Electrode Potential |
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The voltage of the cell given below increases due to: 

Cell: Sn(s) + 2Ag+(aq) → Sn2+(aq) + 2Ag(s)

1. Increase in size of the silver rod.

2. Increase in the concentration of Sn2+ ions.

3. Increase in the concentration of Ag+ ions.

4. None of the above.

Subtopic:  Nernst Equation |
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A 5A current is passed through a solution of copper sulphate for 40 min. The amount of copper deposited at the cathode is 

1. 40.65g

2. 0.45g

3. 3.94g

4. 65.04g

Subtopic:  Faraday’s Law of Electrolysis |
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EFe2+Fe = -0.441 V and EFe3+Fe2+ =0.771 V, the standard emf of the reaction

Fe + 2Fe3+          3Fe2+will be

1. 0.111V

2. 0.330V

3. 1.653V

4. 1.212V

Subtopic:  Electrode & Electrode Potential |
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