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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The standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is -0.74 V. 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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If an iron rod is dipped in CuSO4 solution, then:

1. Blue colour of the solution turns red.

2. Brown layer is deposited on iron rod.

3. No change occurs in the colour of the solution.

4. None of the above.

Subtopic:  Electrochemical Series |
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Without losing it's concentration, ZnCl2 solution cannot be kept in contact with :

1. Au

2. Al

3. Pb

4. Ag

Subtopic:  Electrochemical Series |
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