Question

Which statement correctly explains why H S is a stronger acid than water?

Sulfur (S) has a larger atomic size than oxygen (O), so HS is a more stable, stronger acid than OH .
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Sulfur (S) has a larger atomic size than oxygen (O), so H S is a more stable, stronger acid than H O. 2 2
Sulfur (S) has a larger atomic size than oxygen (O), so H S is a more stable, weaker base than H O. 2 2
Sulfur (S) has a larger atomic size than oxygen (O), so HS is a more stable, weaker base than OH .

Answer 1

The last statement is correct: "Sulfur (S) has a larger atomic size than oxygen (O), so HS− is a more stable, weaker base than OH−."

Brief explanation: the negative charge in HS− is spread over a larger atomic volume on S, giving lower charge density and better stabilization than a high‑density charge on O. A more stable (weaker) conjugate base means the parent acid (H2S) is the stronger acid compared with H2O.