Question

list out all the uses of double displacement reaction.

Answer 1

Application of Double Displacement reactions are listed as follows:

(a) Neutralisation of excess acid in stomach by antacids containing mild bases like Magnesium Hydroxide. The reaction is as shown :

2 HCl + Mg(OH)₂ $\to$ MgCl_​2 + H₂O

(b) Formation of soap. The reaction is:

Fatty acid + NaOH $\to$Sodiumsalt of fatty acid + water

(c) Baking of cake when sodium bicarbonate reacts with acid in cake mixture, releasing CO₂ so that cake becomes fluffy.
The reaction is:

NaHCO₃ + HA $\to$ ANa + CO₂ + H₂O