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Question

In the following chemical reactions:
2KI+A2KCl+B
2KClO3+B2KIO3+Cl2
A and B respectively, are :

A
Cl2, I2
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B
Cl2,Cl2
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C
I2,I2
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D
I2,Cl2
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Solution

The correct option is A Cl2, I2
Cl2 is below I2 in electrochemical series and thus replaces I2 from its solution.
2KI+Cl22KCl+I2
I possesses more tendencey to show +ve oxidation state. The tendency to become electropositive increases down the group.
2KClO3+I22KIO3+Cl2
Therefore, A and B are Cl2 and I2 respectively.

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