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JEE Advanced levelSingle correct optionDifficulty 3 of 3df144

Green aqueous is acidified and disproportionates: . The purple product in the solution is best described as:

  1. Acoloured by d-d transition and diamagnetic
  2. Bcoloured by ligand-to-metal charge transfer and diamagnetic
  3. Ccoloured by d-d transition and paramagnetic with 1 unpaired electron
  4. Dcoloured by ligand-to-metal charge transfer and paramagnetic with 1 unpaired electron

Answer: B

The equation is balanced (3 Mn, 12 O, 4 H, charge -2 on both sides). The purple product is , with Mn(VII) . No d electron means it is diamagnetic and no d-d transition occurs, so its colour is charge transfer.
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