Pure nitric acid on longstanding turns to yellow due to the formation

1.	Pure nitric acid on longstanding turns to yellow due to the formation of
Answer» `O_(2), NO "and" H_(2)O` `O_(2), NO_(2) "and" H_(2)O` `NO, NO_(2) "and" H_(2)O` `N_(2)O, O_(2) "and" H_(2)O` Solution :Pure nitric acid is highly unstable and hence undergoes decomposition forming `NO_(2), H_(2)O "and" O_(2)*NO_(2)` is a reddish BROWN gas. Dilute solution of `NO_(2)` appears as YELLOW colour. `4HNO_(3) RARR 4NO_(2) + 2H_(2)O + O_(2)`

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