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Q.

Electrolysis of a solution of ${MnSO}_{4}$ in aqueous sulphuric acid is a method for the preparation of ${MnO}_{2}$ . Passing a current of 27 A for 4 hours gives 1 kg of ${MnO}_{2}$ . The current efficiency in this process is :

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a

82.951%

b

95.185%

c

80%

d

100%

answer is B.

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Detailed Solution

$\frac{1000 \times 2}{(55 + 32)} = \frac{27 \times 24 \times 3600 \times η}{96500} η = 0 .951 = 95 .1 %$

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