A substance Z reacts with NaOH to give salt and water only. When Z is...

JAMB 1986

A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H₂SO₄. Substance Z is?

A. NaHS
B. Na₂SO₃
C. Na₂S
D. NaHSO₃

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Correct Answer: Option A

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