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  4. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is

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Q. The oxidation state of chromium in the final product formed by the reaction between $KI$ and acidified potassium dichromate solution is

AIIMSAIIMS 2011

Solution:

$Cr _{2} O _{7}^{2-}+14 H^{+}+6 I^{-} \rightarrow 2 Cr ^{3+}+7 H _{2} O +3 I _{2} Cr _{2} O _{7}^{2-}$ is reduced to $C r^{3+}$.
Thus, final state of $Cr$ is $+3$.