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H(2)S gas is passed through an acidic so...

`H_(2)S` gas is passed through an acidic solution of `K_(2)Cr_(2)O_(7)` . The solution turns milky, why?

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This is due to oxidation of `H_(2)S` to sulphur which is of collodial nature. Therefore, the solution appears to be milky white or pale yellow.
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