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Question

In the ionic equation for the reaction:
IO3+H++aeI+H2O
the value of 'a' is

A
2
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B
4
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C
6
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D
10
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Solution

The correct option is C 6
This is a reduction reaciton where the oxidation number of I changes from +5 to -1.

Step -1 Balance atoms other than H and O
IO3I
Step -2 Balance O
IO3I+3H2O
Step -3 Balance H
IO3+6H+I+3H2O
Step -4 Balance Charge
IO3+6H++6eI+3H2O​​​​​​


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