Question

Compound X in crystal form, taken in a dry test tube is heated to give ferric oxide and two sulphur based gases. The compound X is:

• A. Ferrous sulphate
• B. Ferric sulphate
• C. Ferrous oxide
• D. Ferric oxide

Answer 1

The correct option is A

Ferrous sulphate

Ferrous sulphate crystals on heating in test tube decomposes into ferric oxide and sulphur dioxide and sulphur trioxide. The reaction can be represented as:

$2{\text{FeSO}}_4\text{(s)}\stackrel{\text{Heat}}{\to }2{\text{Fe}}_2{\text{O}}_3\text{(s)}+{\text{SO}}_2\text{(g)}+{\text{SO}}_3\text{(g)}$

This is an example of decomposition reaction.