Question

Which one has lowest boiling point ?

• A. $H_{2}O$
• B. $H_{2}S$
• C. $H_{2}Se$
• D. $H_{2}Te$

Answer 1

The correct option is B $H_{2}S$

$H_{2}O$ will have a higher boiling point due to the presence of H-bond.

Among the rest $H_{2}S$ is having lowest boiling point as $H_{2}Se$ and $H_{2}Te$ have higher boiling points than $H_{2}S$ due to bigger size of $Se$ and $Te$.