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Q.

3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water, 20 ml of this solution requires 18 ml of KMnO4 during titration for complete oxidation. The weight of KMnO4 present in one litre of the solution  is

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a

3.476 g

b

12.38 g

c

34.76 g

d

1.238 g

answer is A.

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Detailed Solution

MnO4-+5Fe+2+8H+→Mn+2+5Fe+3+4H2O KMnO4  =  Mohr  saltM1V11 =  M2V25      M1V1 =WMol.wt × V ×1000 ×  V25W × 1000158  × 1000 × 18= 3.92 × 1000392 × 100 × 205 ⇒ W=3.476  g
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