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Manipal MET2018ChemistryRedox Reactions

In the standardization of Na ₂ ~S ₂ O ₃ using K ₂ Cr ₂ O ₇ by iodometry, the equivalent weight of K ₂ Cr ₂ O ₇ is

Options

  1. Amolecular weight/2
  2. Bmolecular weight/6
  3. Cmolecular weight/3
  4. Dsame as molecular weight

Correct answer

B. molecular weight/6

Step-by-step solution

Potassium dichromate acts like an oxidising agent in the presence of dilute H ₂ SO ₄ as: Cr ₂ O ₇ ²⁻+14 H ⁺+6 e⁻ 2 Cr ³⁺+7 H ₂ O Equivalent mass of K ₂ Cr ₂ O ₇= molecular mass of K ₂ Cr ₂ O ₇ 6

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