First slide

Faraday's Laws

Question

Statement 1 : A solution of Ni(NO₃)₂ is electrolysed between platinum electrodes using current of 5 A for 20 minute. The weight of Ni deposited is 1.825 g.
Statement 2 : The mass of substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passed through the electrolyte.

Easy

A

Both statements 1 and 2 are correct
B

Both statements 1 and 2 are incorrect
C

Statement 1 is correct statement 2 is incorrect
D

Statement 1 is incorrect statement 2 is correct

Solution

Electricity used = 5 x 20 x 60 =.6000 C
$Ni {({NO}_{3})}_{2} + 2 H^{+} + \underset{2 F}{2 e^{-}} \to \underset{58.7 g}{Ni} + 2 {HNO}_{3}$
Charge required to deposit 1 mole
Ni = 2 F = 2 x 96500 = 1.93 x 10⁵C
1.93 x 10⁵ C of charge produce Ni = 58.7 g
$6000 C charge will produce Ni = \frac{58.7 \times 6000 C}{1.93 \times 10^{5}} = 1.825 g$
Assertion is true but reason is false as mass of substance deposited is directly proportional to the quantity of electricity passed.

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