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40 g Ba (MnO (4)) (2) (mol. wt, = 375) ...

40 g Ba (`MnO _(4)) _(2) ` (mol. wt, = 375) sample containing some inert impurities in acidic medium is completely reacted with 125 mL of "33.6 V" of `H_(2) O _(2).` What is the percentage purit of the sample ?

A

`28.12 %`

B

`70.31%`

C

`85%`

D

`65%`

Text Solution

Verified by Experts

The correct Answer is:
B
eq. of Ba `(M n O _(4)) _(2) = eq. of H _(2) O _(2)`
`(because M = ( 33. 6)/(11.2) implies 3) (w)/(375) xx 10 = ( 3 xx 125 xx 2)/( 1000) , w = 28. 125` purity `= (w)/(40) xx 100 = (28.125)/(40) xx 100 = 70.31`
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