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The P-Block Elements

Question
CBSEENCH12006792

Illustrate how copper metal can give different products with HNO3.

Solution
Concentrated nitric acid is strong oxidizing agent.
The product of oxidation depend on the concentration of acid, temperture and also the material undergoing oxidation.
Two condition aries :
On heating with dilute nitric oxide NO evolved or on reacting with concentrated nitric acid NO2 is evolved.

reaction with dilute nitric acid 3Cu +8HNO3(dil) 3Cu(NO3)2 +4H2O +2NOReaction with concentrated nitric acidCu +2HNO3(conc.)Cu(NO3)2 +2H2O +2NO2