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Illustrate how copper metal can give dif...

Illustrate how copper metal can give different product on reaction with `HNO_3`.

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On heating with dil. `HNO_(3)`, copper gives copper nitrate and nitric oxide.
`3 Cu + 8 HNO_(3)("dil") overset("Heat")rarr 3 Cu(NO_(3))_(2) + 4H_(2)O + underset("Nitric oxide")(2NO)`
With conc. `HNO_(3)`, instead of `NO, NO_(2)` is evolved.
`Cu + 4HNO_(3)(conc) overset("Heat")rarr Cu(NO_(3))_(2) + 2H_(2)O + underset("Nitrogen dioxide")(2NO_(2))`
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