1.

Iilustrate how copper metal can give different products on reaction with HNO_(3).

Answer»

Solution :On heating with dil. `HNO_(3)`, copper GIVES copper NITRATE and nitric oxide.
`3 Cu + 8 HNO_(3)("dil") overset("Heat")rarr 3 Cu(NO_(3))_(2) + 4H_(2)O + UNDERSET("Nitric oxide")(2NO)`
With CONC. `HNO_(3)`, instead of `NO, NO_(2)` is evolved.
`Cu + 4HNO_(3)(conc) overset("Heat")rarr Cu(NO_(3))_(2) + 2H_(2)O + underset("Nitrogen dioxide")(2NO_(2))`


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