Question

Identify the substance(s) which can be separated as pure crystals from the impure samples.
1. Copper sulphate
2. Potassium nitrate
3. Ferrous sulphate

• A. Only 1
• B. Only 1 and 2
• C. All 1, 2 and 3
• D. Only 3

Answer 1

The correct option is C All 1, 2 and 3

Copper sulphate, potassium nitrate and ferrous sulphate are solids that are soluble in water and form solutions. They can be separated from their solutions using crystallisation technique.
The crystals obtained after crystallisation are pure.