Question

Assertion: Oxygen is more electronegative than sulphur, yet $H_{2}S$ is acidic, while $H_{2}O$ is neutral
Reason: H-S bond is weaker than O-H bond.

• A. if (A) is true, (R) is true and (R) is correct explanation (A)
• B. if both (A) and (R) are true but (R) is not correct explanation of (A)
• C. if (A) is true but (R) is false
• D. if (A) is false and (R) is true

Answer 1

The correct option is A if (A) is true, (R) is true and (R) is correct explanation (A)

Oxygen is more electronegative than sulphur, yet $H_{2}S$ is acidic, while $H_{2}O$ is neutral.
The $S-H$ bond is weaker than $O-H$ bond because size of $S$-atom is bigger than that of $O$-atom. Hence $H_{2}S$ can dissociate to give $H^{+}$ ions in aqueous solution.
So option A is correct.