While preparing crystals of Mohr's salt, dil. H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil. H2SO4 is added here to: (A) prevent t

Question

While preparing crystals of Mohr's salt, dil. H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil. H2SO4 is added here to:

(A) prevent the hydrolysis of ferrous sulphate
(B) prevent the hydrolysis of ammonium sulphate
(C) make the medium strongly acidic
(D) increase the rate of formation of crystals

Prashant Kotian · Accepted Answer

Correct answer: A. Fe +2 ions undergoes hydrolysis, therefore while preparing aqueous solution of ferrous sulphate and ammonium sulphate in water dilute sulphuric acid is added to prevent hydrolysis of ferrous sulphate.

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