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Which one of the following reactions does not result in the evolution of hydrogen gas ?

Options

  1. AReaction of zinc metal with dilute sulphuric acid solution
  2. BMixing water to Plaster of Paris
  3. CHeating zinc metal with sodium hydroxide solution
  4. DReaction of potassium metal with water

Correct answer

B. Mixing water to Plaster of Paris

Step-by-step solution

The chemical equation for the reaction of Plaster of Paris and water can be represented as CaSO ₄ 1 / 2 H ₂ O +3 / 2 H ₂ O CaSO ₄ 2 H ₂ O . It does not produce hydrogen gas. - The reaction between zinc and sulphuric acid produces zinc sulphate and hydrogen gas. In the reaction, bubbles of hydrogen gas should be seen, and the zinc metal will dissolve to form aqueous zinc sulfate H ₂ SO ₄+ Zn H ₂+ ZnSO ₄ - When sodium hydroxide solution is heated with zinc granules then Sodium zincate and hydrogen gas are formed. The

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