When copper is changed to copper(ii) nitrate by the nitric acid, it is an example of a(n) reaction. (two words, include the hyphen with no spaces)

an oxidation-reduction reaction.

Explanation:

This type of reaction is also known as a redox reaction.

Nitric acid is a strong oxidizing agent that oxidizes Cu to Cu 2+. The following reaction takes place :

Cu + 4 HNO3 --> Cu(NO3)2 + 2 NO2 + 2 H2 O

to fully explain the oxidation and reduction consider the following half equations :Cu --> Cu 2+ + 2 e- , In the equation Copper losses two electrons and these electrons gained by the products in the reaction according to the following half equation:

2 e- + 4 HNO3 --->2 NO3 ∧-1  + 2 H2O

the answer is either b or c

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