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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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While preparing crystals of Mohr's salt, dil. H2SO4\mathrm{H}_2 \mathrm{SO}_4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil. H2SO4\mathrm{H}_2 \mathrm{SO}_4 is added here to:
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Correct option: A
Prevent the hydrolysis of ferrous sulphate
Option B (ΔH>TΔS\Delta {H} > {T} \Delta {S}) is correct because for a spontaneous reaction, the change in Gibbs free energy must be negative, and in this case, the magnitude of ΔH\Delta H is greater than TΔST \Delta S.

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