Question

Assertion (A): H2O is liquid while H S is a gas
Reason (R) : Hydrogen bonding is present in both the cases​

Answer 1

Explanation:

H2S (hydrogen sulphide) is a gas because at room temperature the forces and interactions between the molecules of hydrogen sulphide are very weak. The water molecule has a stronger dipole (a negatively and positively charged end to the individual molecule) so these negative and positive ends continually attract each other like magnets of opposite poles, creating more cohesion between the molecules of water--explaining the liquid phase. It also has hydrogen bonding, which boost the attraction.

Answer 2

(There is a mistake in the assertion in the formula of the second compound. The correct assertion statement must be written as: Assertion (A): $\[{H_2}O\]$ is liquid while $\[{H_2}S\]$ is a gas.)

$\[{H_2}O\]$ is liquid while $\[{H_2}S\]$ is a gas. Hydrogen bonding is present in the assertion is correct while the reason is incorrect.

Explanation:

• The molecules of water ($\[{H_2}O\]$) have the ability to form hydrogen bonds.
• The water molecules are held together by hydrogen bonds. Therefore, it is a liquid.
• On the other hand, no such type of interaction is present in $\[{H_2}S\]$.
• Therefore, $\[{H_2}S\]$ it is a gas.
• Hence, the assertion is correct but the reason is incorrect.