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How is commercial nitric acid decolouris...

How is commercial nitric acid decolourised? 

Text Solution

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Because nitrogen dioxide gas (brown colour) dissolves in water to give `HNO_3`.
`underset("Nitrogen dioxide")(4NO_(2)(g)) + underset("Oxygen")(O_2(g)) + underset("water")(2H_2O(1)) to underset("Nitric acid")(4HNO_3(aq))`
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