Chemistry JAMB

What is the change in the oxidation number of copper in the reaction below?

CU2S(s) + O2(g) → 2CU(s) + SO2(g)

A. +1 to 0
B. 0 to +2
C. +2 to +1
D. 0 to +1

Correct Answer:

Option A = +1 to 0

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