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Introduction to Inorganic Chemistry

An orange col...

Question

An orange colour mixture changes to green on acidification. Mixture may contain :

{H g I}_{2}, {C r O}_{4}^{2 -}

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{F e}^{2 +}, {C r}_{2} O_{7}^{2 -}

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{S O}_{3}^{2 -}, {M n O}_{4}^{-}

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{F e}^{2 +}, {C r O}_{4}^{2 -}

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Solution

The correct option is B ${F e}^{2 +}, {C r}_{2} O_{7}^{2 -}$
In acidic medium, ${F e}^{2 +}$ is oxidized to ${F e}^{3 +}$ and ${C r}_{2} O_{7}^{2 -}$ is reduced to $C r (I I I)$ .

Hence, the colour changes from orange to green.

Thus, the mixture contains ${F e}^{2 +}, {C r}_{2} O_{7}^{2 -}$

Option B is correct.

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