The volume of H $_{2}$ in litre formed per hour at STP is________.
(Give answer as greatest integer)

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Solution

The current efficiency for hydrogen production is 40%.
The number of faradays of electricity passed for hydrogen formation is $\frac{0.4 \times 15 \times 3600}{96500} = 0.2238$ faraday.
The number of moles of hydrogen formed is $\frac{0.2238}{2} = 0.1119$ moles.
The volume of hydrogen liberated at STP is $0.1119 \times 22.4 = 2.51$ L.
Greatest integer of $2.51 \approx 3$ .

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