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Q.

How much volume (in mL) of 0.2 M aluminium permanganate solution is required to oxidize completely a 30 mL 0.5 M solution of ferrous oxalate in dil. H₂SO₄ medium?

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a

20

b

30

c

40

d

15

answer is D.

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Detailed Solution

$Al {(\overset{+ 7}{M \underline{n}} O_{4})}_{3} \underset{}{\to} 3 {Mn}^{2 +}$
n-factor = 5 ´ 3 = 15
$\overset{+ 2}{F \underline{e}} {\overset{+ 5 \times 2}{{\underline{C}}_{2} O}}_{4} \underset{}{\to} {Fe}^{3 +} + 2 {\overset{+ 4}{\underline{C} O}}_{2}$
n-factor = 3
V1n1M1 = V2n2M2
V1 ´ 15 ´ 0.2 = 30 ´ 3 ´ 0.5
V1 = 15 Ml

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