Pure HNO_(3) is colourless, howerver, it gradually becomes yellow on s

1.	Pure HNO_(3) is colourless, howerver, it gradually becomes yellow on standing due to _______ .
Answer» the decomposition of `HNO_(3)` and formation of NO. the decomposition of `HNO_(3)` and formation of `NO_(2)`. oxidation by atmospheric `O_(2)` and formation NO. oxidation by atmospheric `O_(2)` and formation of `NO_(2)`. Solution :Pure `HNO_(3)` is highlly unstable which undergoes decomposition giving `H_(2)O, O_(2) "and" NO_(2)* NO_(2)` is a reddish brown gas dissolves in `HNO_(3)` and IMPART yellow colour. `4HNO_(3) rarr 2H_(2)O + 4NO_(2) + O_(2)`

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