Solved 2019 Question Paper ICSE Class 10 Chemistry — Question 7

(i) Reduction of copper (II) oxide by hydrogen.

$\text{CuO} + \text{H}_2 \xrightarrow{\Delta} \text{Cu} + \text{H}_2\text{O} [\text{g}]$

(ii) Action of dilute sulphuric acid on sodium hydroxide.

2NaOH + H₂SO₄ ⟶ Na₂SO₄ + 2H₂O

(iii) Action of dilute sulphuric acid on zinc sulphide.

ZnS + H₂SO₄ (dil.) ⟶ ZnSO₄ + H₂S

(iv) Ammonium hydroxide is added to ferrous sulphate solution.

2NH₄OH + FeSO₄ ⟶ (NH₄)₂SO₄ + Fe(OH)₂

(v) Chlorine gas is reacted with ethene.