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Illustrate how copper metal can give dif...

Illustrate how copper metal can give different products on reaction with `HNO_(3)`.

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The products of the reaction of copper with `HNO_(3)` depends up the concentration of `HNO_(3)` used.
(i) Copper metal reacts with dilute `HNO_(3)` to form nitrogen (II) oxide (NO).
`3Cu+8HNO_(3)rarr 3Cu(NO_(3))_(2)+2NO+4H_(2)O`
(ii) Copper metal react with conc. `HNO_(3)` to form nitrogen dioxide `(NO_(2))` or nitrogen (iv) oxide.
`Cu+underset("conc.")(4HNO_(3))rarr Cu(NO_(3))_(2)+2NO_(2)+2H_(2)O`
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