Question

The substance having the lowest boiling point is:

• A. ${Cl}_2$
• B. ${NH}_3$
• C. $H_{2}O$
• D. $H_{2}S$

Answer 1

Answer: (D)

$H_{2}S$ have lowest boiling point. since we know that liquids have more boiling point than gases. Here $H_{2}O$ is liquid so it will have higher boiling point than others. Out of $C{l}_2$, $N{H}_3$ and $H_{2}S$, $C{l}_2$ has more Boiling point due to its high molecular weight. Now out of $N{H}_3$ and $H_{2}S$, $N{H}_3$ has higher boiling point due to the presence of stronger hydrogen bonding.