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:

(a) 4.6 g

(b) 2.3 g

(c) 6.4 g

(d) 3.2 g

Concept Questions :-

Faraday’s Law of Electrolysis
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Passage of three faraday of charge through aqueous solution of AgNO3, CuSO4, Al(NO3)3 and NaCl will deposit metals at the cathode in the molar ratio of:

1. 1 : 2 : 3 : 1

2. 6 : 3 : 2 : 6

3. 6 : 3 : 0 : 0

4. 3 : 2 : 1 : 0

Concept Questions :-

Faraday’s Law of Electrolysis
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If mercury is used as cathode in the electrolysis of aqueous NaCl solution, the ions discharged at cathode are:

(a) H+

(b) Na+

(c) OH-

(d) Cl-

Concept Questions :-

Active and inert Electrodes
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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 

(a) Y>X>Z

(b) Z>X>Y

(c) X>Y>Z

(d) Y>Z>X

Concept Questions :-

Electrochemical series
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A gas X at 1 atm is doubled through a solution containing a mixture of 1MY- and 1MZ- at 25°C. If the reduction potential of Z > Y > X, then:

(a) Y will oxidise X and not Z

(b) Y will oxidise Z and not X

(c) Y will oxidise both X and Z

(d) Y will reduce both X and Z

Concept Questions :-

Electrochemical series
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The solution of CuSO4 in which copper rod is immersed is diluted to 10 times, the reduction electrode potential:

(a) increases by 0.030 V

(b) decreases by 0.030 V

(c) increases by 0.059 V

(d) decreases by 0.059 V

Concept Questions :-

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 electrolysed by using inert electrodes. The values of standard electrode potentials in volt (reduction potentials) are,

Ag|Ag+ = 0.80,2Hg|Hg22+ = 0.79,

Cu|Cu2+ = +0.34 and Mg|Mg2+ =-2.37

With increasing voltage, the sequency of deposition of metals on the cathode wil be:

(a) Ag, Hg, Cu, Mg

(b) Mg, Cu, Hg, Ag

(c) Ag, Hg, Cu

(d) Cu, Hg, Ag

Concept Questions :-

Electrochemical series
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The highest electrical conductivity of the following aqueous solution is of:

(a) 0.1 M acetic acid

(b) 0.1 M chloro acetic acid

(c) 0.1 M fluoro acetic acid

(d) 0.1 M difluoro acetic acid

Concept Questions :-

Specific and molar Conductance/Conductivity
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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?

(a) 108

(b) 18000

(c) 180

(d) 3000

Concept Questions :-

Faraday’s Law of Electrolysis
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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 ?

(a) Mg2+

(b) Ba2+

(c) Na+

(d) Li+

Concept Questions :-

Electrode Potential / Introduction
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