Question

The purity of a substance is determined by its melting and boiling point.

• A. True
• B. False

Answer 1

The correct option is A True

• A pure substance is one in which all the molecules are of the same kind and it is either an element or a compound.
• Each pure substance has its characteristic properties such as melting and boiling point.
• The melting point of pure water at which ice changes to water is 0°C. Its boiling point at which water boils and changes to steam at sea level is 100°C.
• These values change if impurities are present in water. Hence, we can use these characteristic properties to test whether a substance is pure or not.

Therefore, the given statement is true.