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Q.

Find out % of oxalate ion in a given sample of an alkali metal oxalate salt, 0.30 g of it is dissolved in 100 mL water required 90 mL of centimolar KMnO4 solution in acidic medium.

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a

6.6%

b

66%

c

44%

d

55%

answer is A.

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Detailed Solution

Mn+7O4-+C+32O4-2→Mn+2+2C+4O2
1000×W24+64×2=90×1100×5
w = 0.198 g
% of oxalate ion in a given sample
=0.1980.3×100=66

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