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ICSE Class 9 Chemistry Question 18 of 24

Model Question Paper — 2 — Question 13

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13
Question

Question 6(a)

Give a balanced chemical equation for the following:

(i) Laboratory preparation of hydrogen.

(ii) Preparation of hydrogen from an alkali.

Answer

(i) Laboratory preparation of hydrogen

Zn + 2HCl ⟶ ZnCl2 + H2 ↑

(ii) Hydrogen from alkali

Zn+2NaOH⟶Na2ZnO2[sodium zincate]+H2[g]\text{Zn} + 2\text{NaOH} \longrightarrow \underset{\text{[sodium zincate]}}{\text{Na}_2\text{ZnO}_2} + \text{H}_2 \text{[g]}