Question

In the following reaction:

Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO₂(g) + 2H₂O
(1) which of the following statements about copper is true?
A Copper undergoes reduction and its oxidation number decreases.
B Copper undergoes oxidation and its oxidation number decreases.
C Copper undergoes reduction and its oxidation number increases.
D Copper undergoes oxidation and its oxidation number increases.​

Answer 1

Copper undergoes oxidation and its oxidation number increases.​

Step-by-step explanation:

Copper, here, gains an oxygen molecule on the products' side, so it gets oxidized. When oxidized, the oxidizing number increases, so your answer is D.