Which will liberate bromine from a solution of potassium bromide?
I2
SO2
HI
Cl2
A
Cl2
B
HI
C
I2
D
SO2
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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+Cl2⟶2KCl+Br2
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