Each of the three metals X, Y and Z were put in turn into aqueous solution of the other two.

X + Salt of Y (or Z)   Y (or Z) + Salt of X.

Which observation is probably incorrect?

1. Y + Salt of X = No action observed

2. Y + Salt of Z = Z + Salt of Y

3. Z + Salt of X = X + Salt of Z

4. Z + Salt of Y = No action observed

Subtopic:  Electrochemical Series |
 59%
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The standard reduction potentials of Cu2+/Cu and Cu2+/Cu+ are 0.337 and 0.153V respectively. The standard electrode potential of Cu+/Cu half cell is:

1. 0.184V 

2. 0.827V

3. 0.521V

4. 0.490V

Subtopic:  Electrode & Electrode Potential |
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When a lead storage battery is discharged, then:

1. SO2 is evolved.

2. Lead is formed.

3. Lead sulphate is consumed.

4. Sulphuric acid is consumed.

Subtopic:  Batteries & Salt Bridge |
 59%
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The ratio of masses of hydrogen and magnesium deposited by the same amount of electricity from H2SO4 and MgSO4 in aqueous solution are:

1. 1:8

2. 1:12

3. 1:16

4. none of these

Subtopic:  Faraday’s Law of Electrolysis |
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The molar conductances of Ba2+ and Cl- 127 and 76Ω-1 cm-1 mol-1 respectively at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be

1. 139.52

2. 203

3. 279

4. 101.5

Subtopic:   Kohlrausch Law & Cell Constant |
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A depolariser used in dry cell batteries is: 

1. Ammonium chloride 

2. Manganese dioxide

3. Potassium hydroxide 

4. Sodium phosphate

Subtopic:  Batteries & Salt Bridge |
 52%
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The reaction taking place  at anode when an aqueous solution of CuSO4 is electrolysed using inert Pt electrode:

1. 2SO42-  S2O32- + 2e

2. Cu2+ + 2e Cu

3. 2H2 O2 + 4H+ + 4e

4. 2H+ +2e  H2

Subtopic:  Electrode & Electrode Potential |
 67%
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An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

1. increase in ionic mobility of ions

2. 100% ionisation of electrolyte at normal dilution

3. increase in both, i.e. number of ions and ionic mobility of ions

4. increase in number of ions

Subtopic:   Kohlrausch Law & Cell Constant |
 55%
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For the cell, Ti|Ti+(0.001M)||Cu2+(0.1M)|Cu,Ecell 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 these

Subtopic:  Nernst Equation |
 69%
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The atomic mass of Al is 27. When a current of 5 faraday is passed through a solution of Al3+ ions, the mass of Al deposited is:

1. 27 g

2. 36 g

3. 45 g

4. 9 g

Subtopic:  Faraday’s Law of Electrolysis |
 85%
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