To avoid the precipitation of hydroxides of Ni 2+ , Co 2+ ,…

Chemistry Enviromental Chemistry ( Not In Syllabus ) Practical Chemistry Single Correct MCQ

Published on: August 14, 2026

To avoid the precipitation of hydroxides of Ni 2+ , Co 2+ , Mn 2+ along with those of the third group cations, the solutions should be:

heated with few drops of concentrated HNO 3 .

boiled with excess of ammonium chloride.

concentrated to small volume.

none of these.

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Function of strong electrolyte NH 4 Cl is to suppress the ionisation of NH 4 OH so that the concentration of OH – ions in the solution is decreased but it is sufficient to precipitate the third group basic radicals because the solubility product of group III hydroxides is lower than IV, V and VI group hydroxides. The Cr(OH) 3 ↓ is slightly soluble in excess of precipitant, upon boiling the solution, Cr(OH) 3 is precipitated.

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