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CU2S s O2 g 2CU s SO2 g What is the change in t... - JAMB Chemistry 2002 Question

CU2S(s) + O2(g) → 2CU(s) + SO2(g)
What is the change in the oxidation number of copper in the reaction above?
A
+1 to 0
B
0 to +2
C
+2 to +1
D
0 to +1
correct option: a
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