Question

The critical temp. of water is higher than that of O2 because the H2O molecule has
a.)fewer electrons than O2
b.)two covalent bonds
c.)V-shape
d.)dipole moment

Answer 1

(d) dipole moment.
Critical temperature is directly proportional to intermolecular force of attraction. H2O is a polar molecule, has greater intermolecular force of attraction than O2, hence higher critical temperature.

Answer 2

Answer: Option (d) is the correct answer.

Explanation:

It is known that critical temperature is directly proportional to the intermolecular forces of attraction between a molecule or substance.

As water is a polar molecule and it also has hydrogen bonding. Hence, water molecule has strong intermolecular force of attraction. Water has permanent dipole moment.

Whereas $O_{2}$ is a covalent molecule and has weak intermolecular forces of attraction between its molecules. Oxygen molecule has no permanent dipole moment.

Therefore, we can conclude that critical temperature of of water is higher than that of $O_2$ because the $H_2O$ molecule has dipole moment.