Q.

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).
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Of the following reactions, only one is a redox reaction. Identify it