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give reason nitric acid become brown when released in water.

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Solution

The reaction of water and nitric acid is simply an acid base reaction.
HNO₃ + H₂O $\to$ NO₃^-+ H₃O⁺

(NO₃^- • HNO₃) + H₂O $\to$ (NO₃^-• H₂O • HNO₃)
Nitric acid has substantial quantity of dissolve NO₂ which give the solution a reddish brown coloration.

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