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Chemistry · EQUILIBRIUM

हिन्दी

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In aqueous medium, \( \text{H}_2\text{S} \) is a stronger acid than \( \text{H}_2\text{O} \). Reason (R): The electronegativity of oxygen is lower than that of sulphur, making the H-O bond weaker than the H-S bond. In the light of the above statements, choose the correct answer from the options given below:

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.

Correct answer · Option 3

(A) is true but (R) is false.

Explanation

\( \text{H}_2\text{S} \) is stronger than \( \text{H}_2\text{O} \) due to lower bond strength of H-S down the group. Oxygen is more electronegative than sulfur, so (R) is false.
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