The oxidation state of chromium in the final product formed by the reaction between $K I$ and acidified potassium dichromate solution is:

+ 2

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+ 3

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+ 4

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+ 6

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Solution

The correct option is B $+ 3$
$C r_{2} O_{7}^{2 -} + 6 I^{-} + 14 H^{+} \to 3 I_{2} + 7 H_{2} O + 2 C r^{3 +}$
Oxidation state of chromium in product formed is $+ 3$ .

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