Q15 / 90 · JEE Main 2024 (05 Apr Shift 2) · Chemistry

While preparing crystals of Mohr's salt, dil \(\mathrm{H}_2 \mathrm{SO}_4\) is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil \(\mathrm{H}_2 \mathrm{SO}_4\) is added here to :

  • Correct answer
    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

Solution

$\mathrm{Fe}^{+2}$ 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.

Hence, the correct answer is option: 'A'.

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