Question

During the preparation of Mohr’s salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of \(Fe^{2+}\) ion? 

(1) dilute hydrochloric acid 

(2) concentrated sulphuric acid 

(3) dilute nitric acid 

(4) dilute sulphuric acid

Answer 1

Correct option is (4) dilute sulphuric acid

During the preparation of Mohr’s salt, dilute sulphuric acid is added to prevent the hydrolysis of \(Fe^{2+}\) ion.