Which among the following is a redox reaction ?

1.	Which among the following is a redox reaction ?
Answer» `Ca(OH)_(2) + 2HClrarr CaCl_(2) + 2H_(2)O` `BaCl_(2) + MgSO_(4) rarr BaSO_(4) + MgCl_(2)` `2S_(2)O_(7)^(2-) + 2H_(2)O rarr 4SO_(4)^(2-) + 4H^(+)` `Cu_(2)S+ 2FeO rarr 2Cu + 2Fe + SO_(2)` Answer :D

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