2Cu + O₂ → CuO
CuO + 2HNO₃ → Cu(NO₃)₂ + H₂O
Cu(NO₃)₂ + Pb → Pb(NO₃)₂ + Cu
Ответ: Cu
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2Cu + O₂ → CuO
CuO + 2HNO₃ → Cu(NO₃)₂ + H₂O
Cu(NO₃)₂ + Pb → Pb(NO₃)₂ + Cu
Ответ: Cu