First slide

Faraday's Laws

Question

When an electric current is passed through acidulated water, 112 ml of hydrogen gas at NTP is collected at the cathode in 965 seconds. The current passed in amperes is

Moderate

A

1.0
B

0.5
C

0.1
D

2.0

Solution

No. of equivalents of H₂ liberated $= \frac{Vol of H_{2} liberated}{Vol. Eq of H_{2}} = \frac{112}{11200} = 10^{- 2}$
Number of equivalents deposited = $\frac{it}{96500} \Rightarrow i = \frac{10^{- 2} \times 96500}{965}$ = 1 amp

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