Mixture is initially orange in colour. When solution is prepared in dil. acid, it changes to dark brown colour. Mixture contains :

{H g I}_{2}, {C r}_{2} O_{7}^{2 -}

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I^{-}, {C r}_{2} O_{7}^{2 -}

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I^{-}, {C u}^{2 +}

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I^{-}, S O_{3}^{2 -}

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Solution

The correct option is B $I^{-}, {C r}_{2} O_{7}^{2 -}$
In the presence of an aicd, $I^{-}$ ion is oxidized to iodine and ${C r}_{2} O_{7}^{2 -}$ ion is reduced to chromate ion. Hence, the colour changes from orange to dark brown. Thus, the mixture contains $I^{-}, {C r}_{2} O_{7}^{2 -}$ .

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