The standard reduction electrode potentials of three metals X, Y, and Z are given as -1.2 V, +0.5 V, and -3.0 V, respectively. Based on these values, what is the correct order of their reducing power?

1. Y > X >Z 2. Z > X > Y
3. X > Y > Z 4. Y > Z > X

Subtopic:  Electrochemical Series |
 82%
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During an electrolysis experiment, if a 100 mA current is passed through a solution of AgNO3 for 30 minutes, how many coulombs of electricity will be consumed?

1. 108 C

2. 18000 C

3. 180 C

4. 3000 C

Subtopic:  Faraday’s Law of Electrolysis |
 82%
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Standard reduction potentials at 25°C of Li+/Li, Ba2+/Ba, Na+/Na and Mg2+/Mg are -3.05, -2.90, -2.71 and -2.37 V respectively. Which one of the following is the strongest oxidising agent ?

1. Mg2+

2. Ba2+

3. Na+

4. Li+

Subtopic:  Electrode & Electrode Potential |
 78%
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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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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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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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On the basis of the information available from the reaction.

43Al + O2           23Al2O3, G =-827kJ mol-1 

of O2, the minimum EMF required to carry out the electrolysis of Al2O3 is : (F=96500 C mol-1

1. 2.14 V

2. 4.28 V

3. 6.42 V

4. 8.56 V

Subtopic:  Faraday’s Law of Electrolysis |
 63%
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For the reductidon of silver ions with copper metal, the standard  cell potential was found to be + 0.46 V at 250C. The value of standard Gibbs energy(G0) will be ;
(F = 96500 Cmol-1)

1. -89.0 KJ

2. -89.0 J

3. -44.5 KJ

4. -98.0 KJ

Subtopic:  Relation between Emf, G, Kc & pH |
 71%
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A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively:

1. H2, O2

2. O2, H2

3. O2, Na

4. O2, SO2

Subtopic:  Electrolytic & Electrochemical Cell |
 75%
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What happens to the voltage in a galvanic cell when the salt bridge is removed?

1. The voltage drops to zero.
2. The voltage remains the same.
3. The voltage gradually increases.
4. The voltage rapidly increases.

Subtopic:  Batteries & Salt Bridge |
 78%
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