Question

why is nitric acid not used
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Answer 1

Explanation:

Nitric acid is generally not used for preparation of original solution in analysis of basic radicals, because it is an oxidizing agent which will convert all low oxidation cations into higher one and these cations can not be recognised in presence of this acid.

Answer 2

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Nitric acid is not used for preparation because it is an oxidizing agent which will convert all low oxidation cations into higher one.