Question

Some solids directly change from solid to vapour on heating. The purification technique based on this is called ______.

Options

• Distillation

• Chromatography

• Crystallization

• Sublimation

Answer 1

Some solids directly change from solid to vapour on heating. The purification technique based on this is called Sublimation.

Explanation:

On heating, if a solid directly converts into the gaseous form instead of the liquid form, this process is known as sublimation. So, the technique used to purify such solid substances based on the above principle is known as sublimation.