1.

Before adding the reagents of group III, the solution is heated with some concentrated HNO_(3) in order to

Answer»

OXIDISE `Fe^(2+)` to `Fe^(3+)`
oxidise `Cr^(3+)` to `Cr_(2)O_(7)^(2-)`
LOWER the pH
increase the `[NO_(2)]`

Answer :A


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