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BITSAT2014ChemistrySome Basic Concepts of ChemistryActual

3.92 ~g of ferrous ammonium sulphate react completely with 50 ml N 10 KMnO ₄ solution. The percentage purity of the sample is

Options

  1. A50
  2. B78.4
  3. C80
  4. D39.2

Correct answer

A. 50

Step-by-step solution

Eq of KMnO ₄ used = 50 1 1000 10 =0.005 Eq of FAS reacted =0.005 weight of FAS needed =0.005 392=1.96 ~g Thus percentage purity of FAS is 50 %

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