Which will liberate bromine from a solution of potassium bromide?

I_{2}

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{C l}_{2}

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{S O}_{2}

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H I

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Solution

The correct option is D ${C l}_{2}$
Chlorine is more reactive than bromine and it displaces bromine.
If chlorine is added to a solution of potassium bromide, the bromine is replaced by the chlorine forming potassium chloride. Bromine is formed at the same time and can be detected by its colour.

$2 K B r + {C l}_{2} ⟶ 2 K C l + {B r}_{2}$

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