Answer:
The group reagent is H2S in the presence of NH4Cl .
Explanation:
Mn is fourth group radical in qualitative analysis ;
the group reagent is H2S in the presence of NH4Cl .
then Mn precipitates as buff coloured sulphide , which is soluble in HCl .
MnS + 2HCl ---------> MnCl2 + H2S
on heating the solution with NaOH with bromine water, manganesedioxide gets precipitated.
MnCl2 + 2NaOH --------> Mn(OH)2 + 2NaCl
Mn(OH)2 + O -------> MnO2 + H2O
whereas NiS is insoluble in HCl. the nickel chloride gives a scarlet red precipitate with dimethy gly oxime.
