# The aerosol is a kind of colloid in which : Option 1) solid is dispersed in gas Option 2) gas is dispersed in solid Option 3) gas is dispersed in liquid Option 4) liquid is dispersed in water

Acid rain -

Rainfall and other precipitation with a pH of less than 5.6 . Acidic components, sulphuric acid and nitric acid,
are emitted into the atmosphere from thermal power plants, industries, automobiles.

- wherein

$2SO_{2}(g)+O_{2}(g)+2H_{2}O(l)\rightarrow 2H_{2}SO_{4}(aq)$

$4NO_{2}(g)+O_{2}(g)+2H_{2}O(l)\rightarrow 4HNO_{3}(aq)$

Solid is dispersed in gas.

Aerosol is suspension of fine solid or liquid particles in air or other gas.

Example :- fog,dust,smoke etc.

Option 1)

solid is dispersed in gas

Option 2)

gas is dispersed in solid

Option 3)

gas is dispersed in liquid

Option 4)

liquid is dispersed in water

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