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1 litre solution of KIO 3 of unknown molarity is given to titrate with KI in strong acid medium. 50 mL solution of KIO 3 requires 10 mL of 0.1 M KI for complete reduction to I 2 . The molarity of KIO 3 solution is :

Options

  1. A4 × 1 0 - 3 M
  2. B4 × 1 0 - 4 M
  3. C4 × 1 0 - 5 M
  4. D4 × 1 0 - 2 M

Correct answer

A. 4 × 1 0 - 3 M

Step-by-step solution

1 0 e + 2 I 5 + → I 0 2 2 I - → I 0 2 + 2 e Meq. of KIO 3 = Meq. of I - 5 0 × M × 5 = 1 0 × 0.1 × 1 ∴            M = 1 2 5 0 = 4 × 1 0 - 3

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