Question

write the equation for copper and concentrated nitric acid
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Answer 1

Copper does not react with the dilute hn O3 because dilute hnO3 is a strong oxidizing agent it oxidized H2 produced to water and itself get reduced to any of the nitric oxide.

Answer 2

4 HNO3 + Cu = Cu(NO3)2 + 2 NO2 + 2 H2O