Question

What is the volume ratio of the product gases obtained from the decomposition of phosphorous pentachloride?
$PC{l}_5\text{(g)}\to PC{l}_3\text{(g)}+C{l}_2\text{(g)}$

• A. $2:1$
• B. $1:2$
• C. $1:1$
• D. $1:3$

Answer 1

The correct option is C $1:1$

According to Gay Lussac’s law and the given reaction, 1 volume of $PC{l}_5$ decomposes to give 1 volume of $PC{l}_3$ and 1 volume of $C{l}_2$.
Hence, the volume ratio of $PC{l}_3$ and $C{l}_2$ is $1:1$.