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In a redox titration, potassium dichromate is used as an oxidizing agent in an acidic medium. If the molar mass of potassium dichromate is M , its equivalent weight in this medium is

Options

  1. AM 3
  2. BM 5
  3. CM
  4. DM 6

Correct answer

D. M 6

Step-by-step solution

In an acidic medium, potassium dichromate acts as an oxidizing agent according to the half-reaction: Cr ₂ O ₇²⁻ + 14 H ^+ + 6 e ^- 2 Cr ³⁺ + 7 H ₂ O The oxidation state of chromium in Cr ₂ O ₇²⁻ is +6 . The oxidation state of chromium in the product Cr ³⁺ is +3 . The change in oxidation state per chromium atom is 6 - 3 = 3 . Since there are two chromium atoms in one formula unit of potassium dichromate ( K ₂ Cr ₂ O ₇ ), the total change in oxidation state (n-factor) is 3 2 = 6 . The equivalent weight is given by th

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