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

Pure nitric acid on is a colourless liquid, but on exposure to sunligh

1.	Pure nitric acid on is a colourless liquid, but on exposure to sunlight it turns slightly brown, due toA. 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)`
Answer» Correct Answer - 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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Pure nitric acid on is a colourless liquid, but on exposure to sunlight it turns slightly brown, due toA. 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)`

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