1.

Illustrate how copper metal can give different products on reaction with HNO_3

Answer»

Solution :Copper reacts with dil. `HNO_3` to GIVE different products under different conditions
(i) On heating with dil. `HNO_3`, copper gives copper nitrate and nitric oxide
`3Cu + 8HNO_3(dil.) overset("Heat")to 3Cu(NO_3)_2 + 4H_2O + UNDERSET("Nitric oxide")(2NO)`
(ii) With conc. `HNO_3` , instead of NO, `NO_2` is EVOLVED.
`Cu + 4HNO_3 ( conc. ) overset("Heat")to Cu(NO_3)_2 + 2H_2O + underset("NITROGEN DIOXIDE")(2NO_2)`


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