In which of the following reactions does...

In which of the following reactions does nitric acid acts as an oxidising agent ?

A

`CuO+2HNO_(3) to Cu(NO_(3))_(2)+H_(2)O`

B

`Na_(2)CO_(3)+2HNO_(3) to 2NaNO_(3)+CO_(2)+H_(2)O`

C

`Cu+4HNO_(3) to Cu(NO_(3))_(2)+2H_(2)O+2NO_(2)`

D

`NaOH+HNO_(3) to NaNO_(3)+H_(2)O`

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The correct Answer is:

C

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