There are five types of solutions. These are:
(a) Solution of a solid in a solid. Example: Brass is a solution of zinc and copper.
(b) Solution of a solid in a liquid. Examples: Salt solution and sugar solution
(c) Solution of a liquid in a liquid. Example: Vinegar is a solution of acetic acid in water.
(d) Solution of a gas in a liquid. Example: Soda water is a solution of carbon dioxide gas in water.
(e) Solution of a gas in a gas. Example: Air is a solution of different gases (oxygen, carbon dioxide, nitrogen, argon etc.).