Brown colour in HNO_3 can be removed by – InterviewSolution

1.	Brown colour in HNO_3 can be removed by
Answer» adding Mg powder boiling the ACID PASSING `NH_3` through acid passing AIR through warm acid SOLUTION :Colour is due to presence of `NO_2` in the solution. Removed by passing air . `NO_2` gets removed ALONG with air.

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