7.7     Illustrate how copper metal can give different products on reaction with HNO_{3}.

Answers (1)

Concentrated nitric acid has a  strong oxidizing property. It is used for oxidizing most metals. The concentration of the acid and temperature decides the products of oxidation. 

(i) Cu reacts with dilute HNO_3

              3Cu + 8HNO_3(dilute)\rightarrow 3Cu(NO_3)_2+2NO +4H_2O

(i) Cu reacts with conc. HNO_3

Cu + 4HNO_3(conc)\rightarrow Cu(NO_3)_2+2NO_{2} +2H_2O

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