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Manipal MET2020Chemistryd and f Block Elements

Acidic dichromate ion reacts with hydrogen peroxide to give deep blue colour. This is due to the formation of

Options

  1. ACrO ( O )₂
  2. BCrO ₅
  3. CBoth (a) and (b)
  4. DNone of (a) and (b)

Correct answer

B. CrO ₅

Step-by-step solution

When cold H ₂ O ₂ is added in cold mixture of K ₂ Cr ₂ O ₇ and conc. H ₂ SO ₄ (i.e. K ₂ Cr ₂ O ₇ in acidic medium), a deep blue solution of blue perchromate is obtained as, K ₂ Cr ₂ O ₇+ H ₂ SO ₄ ~K ₂ SO ₄+ H ₂ Cr ₂ O ₇

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