Question

Assertion (A): $H_{2}O$ is a liquid and $H_{2}S$ is a gas at room temperature.
Reason (R): Water molecules are held by H-bonds while in $H_{2}S$ molecules no such interactions are present between the molecules.
[1 Mark]

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false and R is true

Answer 1

The correct option is A Both A and R are true and R is the correct explanation of A

Due to small size and high electronegativity of oxygen atom, water is extensively associated with intermolecular hydrogen bonding but molecules of $H_{2}S$ are held together by van der Waal's forces of attraction. Hence, $H_{2}S$ is a gas and $H_{2}O$ is a liquid at room temperature.