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Manipal MET2010Chemistryd and f Block Elements

When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of

Options

  1. ACrO ₃
  2. BCr ₂ O ₃
  3. CCrO ₅
  4. DCrO ₄²⁻

Correct answer

C. CrO ₅

Step-by-step solution

H ₂ O ₂ oxidises the acidified potassium dichromate solution into blue peroxide of chromium, CrO ₅ . Cr ₂ O ₇²⁻+2 H ⁺+4 H ₂ O ₂ 2 CrO ₅+5 H ₂ O

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