Which of the following reagent(s) can show colour change when ${SO}_{2}$ gas is passed through it?

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Bromine water

Acidic ferric chloride solution

Acidic potassium dichromate solution

Chlorine water

answer is A, B, C.

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Detailed Solution

Bromine water, Acidic potassium dichromate solution and Acidic ferric chloride solution reagent(s) can show colour change when ${SO}_{2}$ gas is passed through it.

Only decolorization occurs when colourless gas is passed over bromine water is the gas. That gas is ${SO}_{2}$ (sulphur dioxide gas), and it has a fantastic reducing ability that allows it to transform coloured solutions into halides. And that loses its colour.

Although ${SO}_{2}$ is oxidised by ${CI}_{2}^{-}$ water, no colour change occurs.

Hence, options A, B and C are correct.

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