Dilute nitric acid reacts with copper to form copper (II) nitrate, nitrogen monoxide and water Zinc reacts with sodium chromate in a sodium hydroxide solution to form NaZnO2, NaCrO2, and H2O
3Cu + 8HNO3 = 3Cu(NO3)2 + 2NO + 4H2O
3Zn + 2Na2CrO4 + 4NaOH = 3Na2ZnO2 + 2NaCrO2 + 2H2O
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