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What is the equivalent mass of IO4^(-) ...

What is the equivalent mass of ` IO_4^(-)` when it is converted into `I_2` in acid medium ?

A

`M//6`

B

` M//7`

C

` M//5`

D

None fo these

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Verified by Experts

The correct Answer is:
B
Equivalent mass
`=("Formula mass")/(("Total change in oxidation number of element"),("oxidized or reduced per mole of species"))`
`overset(+7)(I)O_(4)^(-) rarr 1/2 overset(0)(I_(2))`
`x+4(-2)=-1`
`x=+7`
Since oxidation number of I decreases by 7 units, we have
Equivalenmt mass of `IO_(4)^(-)=(2xx"Formula mass")/(14)`
Equivalent mass `=M/7`
or `2IO_(4)^(-)+16H^(+)+14e^(-) rarr I_(2)+8 H_(2)O`
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