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%
From NCERT
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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 |
 50%
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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 |
From NCERT
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The highest electrical conductivity of the following aqueous solution is of:

1. 0.1 M acetic acid

2. 0.1 M chloroacetic acid

3. 0.1 M fluoro acetic acid

4. 0.1 M difluoro acetic acid

Subtopic:  Conductance & Conductivity |
 72%
From NCERT
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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 |
 80%
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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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When an electric current is passed through acidulated water, 112 mL of hydrogen gas at STP collects at the cathode in 965 second. The current passed, in ampere is:

1. 1.0

2. 0.5

3. 0.1

4. 2.0

Subtopic:  Faraday’s Law of Electrolysis |
 57%
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The electric charge for electrode deposition of 1g equivalent of a substance is:

1. 1 ampere per second

2. 96,500 coulomb per second

3. 1 ampere for 1 hour

4. charge on 1 mole of electrons

Subtopic:  Faraday’s Law of Electrolysis |
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The change in reduction potential of a hydrogen electrode when its solution initialy at pH = 0 is neutralised to pH = 7, is a/an-

1. Increase by 0.059 V 2. Decrease by 0.059 V
3. Increase by 0.41 V 4. Decrease by 0.41 V
Subtopic:  Electrode & Electrode Potential | Nernst Equation |
 52%
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