1.

Fe drops of conc. HNO_3 are added to group II filtrate before proceeding for group III in order to :

Answer»

MAKE acidic medium
convert `Fe^(2+) " to " Fe^(3+) `
convert `Fe^(3+) " to " Fe^(2+) `
boil off `H_2S` GAS from the filtrate .

Solution :Conc.`HNO_3` is added after group II to convert `Fe^(2+) " to " Fe^(3+)` so that it may be PRECIPITATED as `Fe(OH)_3`


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