Fog is a solution of liquid in gas. In chemistry, a solution is a homogeneous mixture of two or more substances. When identifying the constituents of a solution, the terms solute and solvent are used. In this context, fog is formed when tiny droplets of a liquid (usually water) are dispersed in a surrounding gas (air). This type of solution is commonly referred to as an aerosol.
In the given options:
Therefore, the correct answer is Liquid in gas.
‘X’ is a protecting colloid. The following data is obtained for preventing the coagulation of 10 mL of gold sol to which 1 mL of 10% NaCl is added. What is the gold number of ‘X’?