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Solution


Q.

During the preparation of Mohr’s salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion     [2024]
1 Dilute hydrochloric acid  
2 Concentrated sulphuric acid  
3 Dilute nitric acid  
4 Dilute sulphuric acid  

Ans.

(4)

Dilute sulphuric acid is typically added to aqueous solution of Mohr's salt in order to prevent the hydrolysis of ferrous sulphate.