In which of the following reactions, the...

In which of the following reactions, the underlined substance has been reduced ?

A

`underline(Br_(2))+underline(H_(2)S)rarr2HBr+S`

B

`underline(2HgCl_(2))+SnCl_(2)rarrunderline(Hg_(2)Cl_(2))+SnCl_(4)`

C

`Cl_(2)+underline(2KI)rarr2KCl+ underline(I_(2))`

D

`2Cu^(+2)+4I^(-)rarrunderline(Cu_(2)I_(2))+I_(2)`

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The correct Answer is:

C

In KI, I has O.N of -1. As it changes to `I_(2)`. The O.N increases from -1 to 0.

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