3.95g KMNO4 was dissolved in 2.5l of water. 100 ml of this solution neutralizes a solution containing 1.25g of impure mixture of oxalic acid. What is the purity percentage of oxalic acid?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane