Q 2509867718.     Of the following reactions, only one is a redox reaction. Identify this reaction.

BCECE 2015 Mains
A

`Ca(OH)_2 + 2HCl -> CaCl_2 + 2H_2O`

B

`2S_2O_7^(2-) + 2H_2O -> 2SO_4^(2-) + 4H^+`

C

`BaCl_2 + MgSO_4 -> BaSO_4 + MgCl_2`

D

`Cu_2S + 2FeO -> 2Cu + 2Fe + SO_2`

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