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

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
Correct Answer: Option A
Explanation