Q44. 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, $\mathrm { dil } \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ is added here to :\\
(1) prevent the hydrolysis of ferrous sulphate\\
(2) prevent the hydrolysis of ammonium sulphate\\
(3) make the medium strongly acidic\\
(4) increase the rate of formation of crystals