Question

Impure substances are obtained by combining two or more _________ substances together without any change in their _______ properties.

• A. Pure
• B. chemical

Answer 1

An impure substance or mixture is one that is made up of more than one element or compound, often known as a mixture without undergoing any chemical reactions.

• Air is an impure substance made of different pure substances, like nitrogen, oxygen, carbon dioxide, etc.
• The constituents or pure substances in an impure substance retain their individual properties.
• For example, air helps in burning due to the presence of oxygen, and air also helps in extinguishing fire due to the presence of carbon dioxide.
• All the constituents in an impure substance chemically remain unchanged.
• Impure substances are also called mixtures.

Thus Impure substances or mixtures are obtained by combining two or more pure substances together without any change in their chemical properties.