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Chemistry Class 12
Solutions to CBSE Sample Paper - Chemistry Class 12

KMnO 4 is coloured due to:

  1. d-d transitions
  2. charge transfer from ligand to metal
  3. unpaired electrons in d orbital of Mn
  4. charge transfer from metal to ligand



b. charge transfer from ligand to metal

The Mn atom in KMnO4 has +7 oxidation state with electron configuration [Ar]3d 0 4s 0 Since no unpaired electrons are present, d−d transitions are not possible. The molecule should, therefore, be colourless.

Its intense purple due to L→M (ligand to metal) charge transfer 2p(L) of O to 3d(M) of Mn.

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.