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 |
 58%
From NCERT
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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 |
 51%
From NCERT
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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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A hydrogen gas electrode is made by dipping platinum wire in a solution of HCI of pH = 10 and by passing hydrogen gas around the platinum wire at 1 atm pressure. The oxidation potential of the electrode would be:

1. 0.059 V
2. 0.59 V
3. 00.118 V
4. 1.18 V

Subtopic:  Electrode & Electrode Potential |
 77%
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4.5 g of aluminium (atomic mass 27u) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be

1. 44.8 L

2. 22.4 L

3. 11.2 L

4. 5.6 L

Subtopic:  Faraday’s Law of Electrolysis |
 59%
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Which one of the following pairs of substances on reaction will not evolve H2 gas?

1. Iron and H2SO4 (aq)

2. iron and steam

3. Copper and HCl(aq)

4. Sodium and ethyl alcohol

Subtopic:  Preparation & Properties |
 65%
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