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Explain the following chemical reactions...

Explain the following chemical reactions and write the balanced chemical equations.
Copper added to concentrated nitric acid.

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When copper is added to concentrated nitric acid, reddish coloured poisonous nitrogen dioxide gas is formed.
`underset("Copper")(Cu_((s)))+underset("(Concentrated)")(4HNO_(3(a)))rarr underset(underset("nitrate")"Copper (II)")(Cu(NO_3)_(2(aq)))+underset(underset("dioxide")"Nitrogen")(2NO_2uarr)+2H_2O_((l))`
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