Question

$H_{2}O$ is a liquid but $H_{2}S$ is a gas. Explain why?

Answer 1

In water, Hydrogen bonding is possible resulting in strong inter-nuclear bonding because of high electro-negativity of oxygen while in $H_{2}S$, only weak Van Der Waal's or London force of attraction between molecules is possible.

Therefore, $H_{2}O$ is liquid & $H_{2}S$ is gas at room temperature.