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

Chemistry 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?

  • NaHS checkmark
  • Na2SO3
  • Na2S
  • NaHSO3

The correct answer is: A

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