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In the following reaction, the values fo...

In the following reaction, the values fo ` x,y` and `z` respectively, are
`xl^(-) + yIO_3^(-)+zH^(+) rarr I_2 + H_2O`.

A

`5, 6, 1`

B

`5, 1, 6`

C

`6, 1, 5`

D

`1, 5, 6`

Text Solution

Verified by Experts

The correct Answer is:
B
`overset(-1)(I^(-))+overset(+5)(I)O_(3)^(-)+overset(+1)(H^(+)) rarr overset(0)(I_(2))+overset(+1)(H_(2))overset(-2)(O)`
Oxidation half-reaction: `2I^(-) rarr I_(2)+2e^(-)`
Reduction half-reaction : `2IO_(3)^(-) rarr I_(2)`
Balance ionic charges by adding `H^(+)` ions:
`2I^(-) rarr I_(2)+2e^(-)`
`2IO_(3)^(-)+12H^(+)+10e^(-) rarr I_(2)`
Balance H and O adding `H_(2)O` molecules
`2I^(-) rarr I_(2)+2e^(-)`
`2IO_(3)^(-)+12H^(+)+10e^(-) rarr I_(2)+6H_(2)O`
To equalize electron transfer, we multiply oxidation half-reaction by 5 and add them, cancelling electrons on both sides:
`10I^(-)+2IO_(3)^(-)+12H^(+) rarr 6I_(2)+6H_(2)O`
or `5I^(-)+IO_(3)^(-)+6H^(+) rarr 3I_(2)+3H_(2)O`
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