1.

Few drops of HNO_(3) are added to II group before proceeding to III group in order to

Answer»

CONVERT `Fe^(+2)` to `Fe^(+3)`
convert `Fe^(+3)` to `Fe^(+2)`
PPT III group
convert `Fe^(2+)` to Fe

Solution :`3FE^(2+)+HNO_(3)+3H^(+) to NO uarr +3Fe^(3+)+2H_(2)O`


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