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CBSE Class 11-science Answered

Justify that the reaction 2Cu2O(s)+Cu2S(s)   →   6Cu(s)+SO2(g) is a redox reaction.
Asked by Topperlearning User | 15 Apr, 2015, 11:14: AM
answered-by-expert Expert Answer
Writing the oxidation number of each atom above its symbol, we have
 
                               +1  -2         +1  -2                  0            +4 -2

                        2Cu2O(s)  + Cu2S(s) →   6Cu(s)   +   SO2(g)

Here in the reaction, the oxidation number of copper decreases from +1 in Cu2O or Cu2S to 0 in copper metal, therefore copper is reduced. Further the oxidation number of S increases from -2 in Cu2S to +4 in SO2, therefore S is oxidised. Therefore, this reaction is a redox reaction.

Answered by | 15 Apr, 2015, 01:14: PM
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