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50 ml of given H(2)O(2) solution is adde...

50 ml of given `H_(2)O_(2)` solution is added to excess KI solution in acidic medium. The liberated `I_(2)` requires 20 ml of 0.04 M standard Hypo solution.
Molarity of `H_(2)O_(2)` solution is

A

`8xx10^(-3)M`

B

`4xx10^(-3)M`

C

`5xx10^(-3)M`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
`2I^(-)+H_(2)O_(2)+2H^(+)rarr2H_(2)O+I_(2)`
`I_(2)+2S_(2)O_(3)^(-2)rarr2I^(-)+S_(4)O_(6)^(-2)`
Eqts of `H_(2)O_(2)` = Eq `Na_(2)S_(2)O_(3)`
`(2xx50)/(1000)xxM=(1xx20)/(1000)xx0.04impliesM=8xx10^(-3)`
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