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

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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