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Question

Which will liberate bromine from a solution of potassium bromide?
  1. I2
  2. SO2
  3. HI
  4. Cl2

A
Cl2
B
HI
C
I2
D
SO2
Solution
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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+Cl22KCl+Br2

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