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

Options

A. `O_(2), NO "and" H_(2)O`
B. `O_(2), NO_(2) "and" H_(2)O`
C. `NO, NO_(2) "and" H_(2)O`
D. `N_(2)O, O_(2) "and" H_(2)O`

Answer

B

Explanation

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)`