First slide

Faraday's Laws

Question

During electrolysis of molten sodium chloride, time required to produce 0.20 mole of chlorine gas using a current of 6 amperes is

Easy

A

65 minutes
B

220 minutes
C

107 minutes
D

330 minutes

Solution

At anode
${Cl}^{-} ⟶ \frac{1}{2} {Cl}_{2} + e^{-}$
For 0.5 mole → 96500 Coulombs
$\begin{array}{l} 1 ⟶ \frac{96500}{0 .5} \\ 0 .2 ⟶ \frac{96500}{0 .5} \times 0 .2 = 38600 C \end{array}$
$∴$ Q = I × t
$\Rightarrow$ 38600 = 6 × t
$t (\sec) = \frac{38600}{6} = 6433 .33$
Time (minute) = 107 minutes (approx.)

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