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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?
A
dilute nitric acid
B
dilute sulphuric acid
C
dilute hydrochloric acid
D
concentrated sulphuric acid
Detailed Solution
$Fe^{2+}$ (and $Al^{3+}$) ions undergo hydrolysis in water.
So while preparing an aqueous solution of ferrous ammonium sulphate (Mohr's salt), 2–3 mL of dilute sulphuric acid is added to prevent the hydrolysis of $Fe^{2+}$ ions.