Concentrated nitric acid upon long standing turns yellowish-brown due to the formation of :
Concentrated nitric acid upon long standing turns yellowish-brown due to the formation of :
A. `NO `
B. `NO_(2)`
C. `N_(2)O`
D. `N_(2)O_(4)`
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Correct Answer - B
`NO_2` is a brown coloured gas and imparts this colour to concentrated `HNO_3` upon long standing .
`4HNO_(3) to 2H_2O +4NO_(2)+O_(2)`
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