1.

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

Answer»

HEATED with few drops of conc. `HNO_(3)`
heated with EXCESS of ammonium chloride
concentrated to small volume
none of these

Solution :FUNCTIONS 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.


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