Of the following reactions, only one is a redox reaction. Identify it
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a
Ca(OH)2+2HCl→CaCl2+2H2O
b
BaCl2+MgSO4→BaSO4+MgCl2
c
2S2O72−+2H2O→4SO42−+4H+
d
Cu2S+2FeO→2Cu+2Fe+SO2
answer is D.
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Detailed Solution
In redox reaction oxidation and reduction take place side by side. Cu2S+2FeO→2Cu+2Fe+SO2 O.N. of Cu changes from +1 to 0 (reduction) andO.N. of S changes from −2 to +4 (oxidation).