Question

The volume of gases obtained at the anode at STP ($1$ bar and $298K$) when $2$ faraday of electricity is passed is

• A. $67.2$ litres
• B. $68.1$ litres
• C. $73.2$ litres
• D. $74.1$ litres

Answer 1

The correct option is D $74.1$ litres

At anode 2 mol of $C{O}_2$ + 1 mol of propyne gas is obtained by 2 faraday (since two electrons are produced).
1. Volume of 1 mol of gas at STP (1 atmosphere, 273 K) = 22.4 litres
2. Volume of 1 mol of gas at STP (1 bar, 273 K) = 22.7 litres
3. Volume of 1 mol of gas at standard conditions (1 atmosphere, 298 K) = 24.4 litres
4. Volume of 1 mol of gas at standard conditions (1 bar, 298 K) = 24.7 litres
2 faraday $\Rightarrow$ 3 mol gases under standard conditions (1 bar, 298 K)
$\Rightarrow 3\times 24.7$ litres = $74.1$ litres.

So the answer is option (D).