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Before adding the reagents of group III,...

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

A

oxidise `Fe^(2+)` to `Fe^(3+)`

B

oxidise `Cr^(3+)` to `Cr_(2)O_(7)^(2-)`

C

lower than pH

D

increase the `NO_(3)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
A
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