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ICSE Class 9 Chemistry Question 17 of 26

Study of the First Element — Hydrogen — Question 5

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5
Question

Question 5(1984)

How can you obtain hydrogen from sodium hydroxide [not by electrolysis].

Answer

When powdered zinc reacts with sodium hydroxide it produces hydrogen.

Zn+2NaOH⟶Na2ZnO2sodium zincate+H2[g]\text{Zn} + 2\text{NaOH} \longrightarrow \underset{\text{sodium zincate}}{\text{Na}_2\text{ZnO}_2} + \text{H}_2 \text{[g]}