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State why pure nitric acid takes on a ye...

State why pure nitric acid takes on a yellowish brown colour when exposed to light.

Text Solution

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Because `HNO_3` decomposes to give `NO_2` (brown colour gas)
`underset("Nitric acid")(4HNO_3) to underset("Water")(2H_2O) + underset("Nitrogen dioxide")(4NO_2(g)) + underset("oxygen")(O_2(g))`
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