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Question

Which will liberate bromine from a solution of potassium bromide?


A
I2
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B
Cl2
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C
SO2
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D
HI
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Solution

The correct option is D $$\displaystyle { Cl }_{ 2 }$$
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.

$$2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }$$

Chemistry
NCERT
Standard XII

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