1.

Illustrate how copper metal can give different product on reaction with `HNO_3`.

Answer» Reactions of Cu metal with `HNO_3`:
(i). `Cu+dil.HNO_3overset(Delta)toNO` is evolved (colourless gas)
`3Cu+8HNO_3overset(Delta)to3Cu(NO_3)_2+4H_2O+2NO`
(ii). `Cu+conc.HNO_3overset(Delta)toNO_2` is evolved
`Cu+4HNO_3overset(Delta)Cu(NO_3)_2+2H_2O+2NO_2`


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