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10 g sample of H(2)O(2) just decolorised...

10 g sample of `H_(2)O_(2)` just decolorised 100 ml of 0.1 M `KMnO_(4)` in acidic medium % by mass of `H_(2)O_(2)` in the sample is

A

`3.40`

B

`8.5`

C

`17.0`

D

`1.70`

Text Solution

Verified by Experts

The correct Answer is:
B
Eq. `H_(2)O_(2)` = Eq. `KMnO_(4)`
`(w)/(34)xx2=0.1xx0.1xx5impliesw=0.85gm`
implies % purity = `(0.85)/(10)xx100=8.5%`
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