The Zn acts as sacrificial or cathodic protection to prevent rusting of iron because:

(1) EOP of Zn < EOP of Fe

(2) EOP of Zn > EOP of Fe

(3) EOP of Zn = EOP of fe

(4) Zn is cheaper than iron

Subtopic:  Corrosion |
 77%
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What mass of copper will be deposited by passing 2 Faraday of electricity through a solution of Cu(II) salt?

(1) 35.6 g

(2) 63.5 g

(3) 6.35 g

(4) 3.56 g

 

Subtopic:  Faraday’s Law of Electrolysis |
 86%
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The same amount of electricity was passed through two cells containing molten Al2O3 and molten NaCl. If 1.8g of Al were liberated in one cell, the amount of Na liberated in the other cell is:

(1) 4.6 g

(2) 2.3 g

(3) 6.4 g

(4) 3.2 g

Subtopic:  Faraday’s Law of Electrolysis |
 76%
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Standard Reduction electrode potential of three metals X, Y and Z are -1.2V, + 0.5V and -3V respectively. The reducing power of these metals will be 

(1) Y>X>Z

(2) Z>X>Y

(3) X>Y>Z

(4) Y>Z>X

Subtopic:  Electrochemical Series |
 88%
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How many columbs of electricity are consumed when 100 mA current is passed through a solution of AgNO3 for 30 minute during an electrolysis experiment?

(1) 108

(2) 18000

(3) 180

(4) 3000

Subtopic:  Faraday’s Law of Electrolysis |
 81%
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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 |
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For the cell, Ti/Ti+(0.001M)||Cu2+(0.1M)|Cu, Ecello 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 the above.

Subtopic:  Nernst Equation | Faraday’s Law of Electrolysis |
 72%
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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 electrode would be

1. 0.059 V

2. 0.59 V

3. 00.118 V

4. 1.18 V

Subtopic:  Electrode & Electrode Potential |
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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) 27g

(2) 36g

(3) 45g

(4) 9g

Subtopic:  Faraday’s Law of Electrolysis |
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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 |
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