# If the boiling point of

Question:

If the boiling point of $\mathrm{H}_{2} \mathrm{O}$ is $373 \mathrm{~K}$, the boiling point of $\mathrm{H}_{2} \mathrm{~S}$ will be :

1.  less than $300 \mathrm{~K}$

2. equal to $373 \mathrm{~K}$

3. more than $373 \mathrm{~K}$

4. greater than $300 \mathrm{~K}$ but less than $373 \mathrm{~K}$

Correct Option: 1

Solution:

At room temperature, water is liquid and has boiling point $373 \mathrm{~K}$ due to hydrogen bonding. Whereas $\mathrm{H}_{2} \mathrm{~S}$ is a gas and it has no hydrogen bonding. Hence boiling point of $\mathrm{H}_{2} \mathrm{~S}$ is less than $300 \mathrm{~K}$ (boiling point of $\mathrm{H}_{2} \mathrm{~S}$ is $-60^{\circ} \mathrm{C}$ ).