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Pure nitric acid on is a colourless liqu...

Pure nitric acid on is a colourless liquid, but on exposure to sunlight it turns slightly brown, due to

A

the formation of `H_(3)O^(+)` and `NO_(3)^(+)`

B

the formation of `N_(2)O`

C

slight decomposition into `NO_(2)` and `O_(2)`

D

slight decomposition into `N_(2)O` and `O_(2)`

Text Solution

Verified by Experts

The correct Answer is:
3
Concentrated nitric acid decomposes photochemically and gradually assumes a yellow colour due to the presence of dissolved nitrogen dioxide:
`4HNO_(3)(aq.)rarr4NO_(2) (aq)+ 2H_(2)O (l)+O_(2)(g)`
The same reaction occurs but at a much faster rate, when the acid is heated.
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