Explain how copper replace hydrogen in this reaction although copper comes after hydrogen in chemical activity series ( by chemical equations) Cu + 4HNO₃ ⇒ Cu(NO₃)₂ + 2NO₂ + 2H₂O It’s an o

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Explain how copper restore hydrogen in this reaction although copper comes behind hydrogen in chemical enthusiasm train ( by chemical equations)

Cu + 4HNO₃ ⇒ Cu(NO₃)₂ + 2NO₂ + 2H₂O

It's an oxidation-reduction reaction

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