Question

$P{H}_3$ and $H_{2}S$ which is more acidic and why?

Answer 1

$H_{2}S$ is more acidic than $P{H}_3$ because $S$ is more electronegative than $P$. Due to higher electron negativity difference $S-H$ bond is more polar than $P-H$ bond resulting in easier removal of $H^{+}$ ion.