Question

The purity of a substance can be tested by checking its _________ or __________.

• A. Melting point or boiling point
• B. Boiling point
• C. Melting point
• D. Freezing point

Answer 1

The correct option is

D

Melting point or boiling point

A pure substance has a fixed melting point or boiling point at constant pressure. The purity of a substance can be tested by checking its melting point or boiling point. If a substance is impure i.e. it contains traces of another substance, the melting and boiling point of that substance will change.

For solid substances we test the melting points thus here substances is asked tht's why answer is D.

Hope you understand