Q56Short answer
Give an example to show the effect of concentration of nitric acid on the formation of oxidation product.
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Dilute and concentrated nitric acid give different oxidation products on reaction with copper metal. 3Cu + 8HNO3 (dil.) → 3Cu(NO3)2 + 2NO + 4H2O Cu + 4HNO3 (Conc.) → 3Cu(NO3)2 + 2NO + 2H2O