Q. 19: Tried it so many times. Not getting the right answer.
PS. Sorry for the bad image, using old phone right now.
Anyone @seshu_ram @pratyaksh_tyagi @Supreeta_Sen @Mayank_Agarwal @Mayank_Chowdhary
Please provide better pic. Or type the question.
A 458 gm sample of Mn3O4 was dissolved and all manganese was converted to Mn+2. In the presence of fluoride ion, Mn+2 I titrated with 3 lit. of KMnO4 solution (which was 1.25 N against oxalate in acidic medium), both reactant being converted to a complex of Mn(III). What was the % of Mn3O4 in the sample?
Volume of oxalate is not given so question is likely incomplete
But we do not need volume of oxalate for proceeding further. We can find molarity of KMnO4 from the reaction with oxalate since Normality = M × VF, right?
What's the answer?
I read wrong. I'm sorry
50% is the answer