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
66%
b
55%
c
44%
d
6.6%
answer is A.
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Detailed Solution
Mn+7O4-+C+32O4-2→Mn+2+2C+4O21000×W24+64×2=90×1100×5w = 0.198 g% of oxalate ion in a given sample=0.1980.3×100=66