1.

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

Answer»

Solution :The OXIDIZING nature of `HNO_3` depends on
(i) CONCENTRATION of an acid
(II) Nature of metal
(iii) Temperature of the reaction:
`UNDERSET("dilute")(3Cu + 8HNO_(3) to 3Cu(NO_(3))_(2) + 2NO + 4H_(2)O`
`underset("conc")(Cu + 4HNO_(3) to Cu(NO_(3))_(2) + 2NO_(2) + 2H_(2)O`


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