In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam because :

1. Hg is more inert than Pt

2. More voltage is required to reduce H+ at Hg than at Pt

3. Na is dissolved in Hg while it does not dissolve in Pt

4. Concentration of H+ ions is larger when Pt electrode is taken.

Subtopic:  Electrode & Electrode Potential |
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The same amount of electricity was passed through two cells containing molten Al2O3 and molten NaCl. If 1.8 g 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 |
 72%
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If mercury is used as cathode in the electrolysis of aqueous NaCl solution, the ions discharged at cathode are:

1. H+

2. Na+

3. OH-

4. Cl-

Subtopic:  Electrode & Electrode Potential |
 59%
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A gas X at 1 atm is bubbled through a solution containing a mixture of 1MY- and 1MZ- at 25°C. If the reduction potential of Z > Y > X, then:

1. Y will oxidise X and not Z

2. Y will oxidise Z and not X

3. Y will oxidise both X and Z

4. Y will reduce both X and Z

Subtopic:  Electrochemical Series |
 66%
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The solution of CuSO4 in which copper rod is immersed is diluted to 10 times, the reduction electrode potential:

1. increases by 0.030 V

2. decreases by 0.030 V

3. increases by 0.059 V

4. decreases by 0.059 V

Subtopic:  Nernst Equation |
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A solution containing one mole per litre each of Cu(NO3)2, AgNO3, Hg2(NO3)2 and Mg(NO3)2 is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volt (reduction potentials) are,

Ag/Ag = 0.80 V, Hg22+/2Hg = 0.79 V,

Cu2+/Cu = +0.34 V and Mg2+/Mg = -2.37 V

With increasing voltage, the sequence of deposition of metals on the cathode will be:

1. Ag, Hg, Cu, Mg

2. Mg, Cu, Hg, Ag

3. Ag, Hg, Cu

4. Cu, Hg, Ag

Subtopic:  Electrochemical Series |
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Which of the following aqueous solutions has the highest electrical conductivity?

1. 0.1 M Acetic acid

2. 0.1 M Chloroacetic acid

3. 0.1 M Fluoroacetic acid

4. 0.1 M Difluoroacetic acid

Subtopic:  Conductance & Conductivity |
 72%
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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 |
 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 |
 78%
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Equivalent conductances of NaCl, HCl and C2H5COONa at infinite dilution are 126.45, 426.16 and 91 Ω-1cm2. The equivalent conductance of C2H5COOH is : 

1. 201.28 Ω-1cm2

2. 390.71 Ω-1cm2

3. 698.28 Ω-1cm2

4. 540.48 Ω-1cm2

Subtopic:  Conductance & Conductivity |
 91%
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