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Most Important Selected Qs for JEE AdvancedChemistryHydrogen

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

Options

  1. Aacidified potassium chromate
  2. Balkaline potassium dichromate
  3. Cacidified potassium manganate
  4. Dacidified potassium permanganate

Correct answer

A. acidified potassium chromate

Step-by-step solution

Both chromate and dichromate radicals on reaction with acidified H ₂ O ₂ give blue solution which turns green on standing. In the presence of organic solvents such as diethyl ether, amyl alcohol or pyridine, permanent blue colour obtained. K ₂ Cr ₂ O ₄+ H ₂ SO ₄+ H ₂ O ₂ Ether CrO ₅+ K ₂ SO ₄ + K ₂ Cr ₂ O ₇+4 H ₂ SO ₄+4 H ₂ O ₂ Ether (Blue colour) 2 CrO ₅ + K ₂ SO ₄ +5 H ₂ O

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