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 is A

No explanation has been provided for this answer.

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