Question

Identify the correct statement(s) given below.

(a) $O_2$ is paramagnetic.
(b) $H_{2}O$ is liquid while $H_{2}S$ is gas under given conditions.
(c) Boiling point of $H_{2}O$ is abnormally high.

• A. (b) & (c) are correct
• B. Only (a) is correct
• C. Only (a) & (b) are correct
• D. All are correct.

Answer 1

Answer: (D)

All are correct.

(a) Due to the presence of two unpaired electrons in anti-bonding molecular orbitals, $O_2$ is paramagnetic.

(b) $H_{2}O$ molecules have intermolecular H-bonding due to greater electronegativity of oxygen hence, $H_{2}O$ is liquid; $H_{2}S$ lacks H-bonding hence, gas

(c) Due to intermolecular H-bonding Boiling point of H${}_2$O is abnormally high.

Hence, the correct option is $A$