Question

Identify the type of chemical reaction taking place
(i) on mixing a solution of potassium chloride with silver nitrate, an insoluble white substance is formed.
(ii)on heating green coloured ferrous sulphate crystals, reddish-brown solid is left and smell of a gas having odour of burning sulphur is observed.

Answer 1

This reaction is an example of double displacement and precipitation reaction in which a precipitate of silver chloride is obtained.

This reaction is an example of decomposition (thermal decomposition) reaction because a single substance (FeSO₄) breaks down into three substances (Fe₂O₃, SO₂ and SO₃). Here, SO₂  gives the smell of burning sulphur.