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KCET2020Chemistryd and f Block Elements

How many moles of acidified K ₂ Cr ₂ O ₇ is required to liberate 6 moles of I ₂ from an aqueous solution of I ⁻ ?

Options

  1. A2
  2. B1
  3. C0.25
  4. D0.5

Correct answer

A. 2

Step-by-step solution

We know, Cr ₂ O ₇⁻²+6 I ⁻+14 H ⁺ 2 Cr ³⁺+3 I ₂+7 H ₂ O Here, 3 moles of I ₂ liberation requires one mol of K ₂ Cr ₂ O ₇ ; for getting 6 moles of I ₂ , we will require two moles of K ₂ Cr ₂ O ₇ .

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