1.

15 gm Ba(MnO_4)_2 sample containing inert impurity is completely reacting with 100 ml of 11.2 V' H_2O_2, then what will be the % purity of Ba(MnO_4)_2 in the sample ? (Atomic mass Ba=137, Mn=55)

Answer»

`5%`
`10%`
`50%`
none

Solution :Normality of `H_2O_2=11.2/5.6N`
milli equivalents `Ba(MnO_4)_2` reacted=milli equivalents of `H_2O_2` reacted =2x100=200 meq=0.2 GRAM eq
Moles of `Ba(MnO_4)_2implies0.2/10=0.02 " " :. Wt. of Ba(MnO_4)_2=0.02xx375`
% purity of `Ba(MnO_4)_2=(375xx0.02)/15xx100=50%`


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