Question

Pure salts can be extracted from its solution using the method called .

• A. filtration
• B. crystallisation
• C. vapourisation

Answer 1

The correct option is B crystallisation

Crystallisation is a technique used to separate out dissolved salts as crystals, from their saturated solutions.
- This involves heating the saturated solution at high temperature and then cooling it down.
- This leads to gradual formation of crystals.
- The salts that crystallize out are mostly pure and free of impurities.
Salts like copper sulphate can be purified by this method.

Filtration is a separation technique used mostly to separate the solute particles of a suspension.

The conversion of a liquid into gas is called vapourisation.