Among N i C O 4 ,   N i C l 4 2 - ,   C o N H 3 4 C l 2 C l ,   N a 3 C o F 6 ,   N a 2…

Among NiCO4, NiCl42-, CoNH34Cl2Cl, Na3CoF6, Na2O2 and CsO2, the total number of paramagnetic compounds is
  1. 2
  2. 3
  3. 4
  4. 5

Solution

  Compound/Ion   Unpaired Electron Magnetic nature of compound
1] NiCO4 3d10, sp3 0 Diamagnetic
2] CoNH34Cl2Cl 3d6, d2sp3 0 Paramagnetic
3] NiCl42- 3d8, sp3 2 Diamagnetic
4] Na3CoF6 3d6, sp3d2 4 Paramagnetic
5] Na2O2 O22- 0 Diamagnetic
6] CsO2 O2-1 1 Paramagnetic
So, the total number of paramagnetic compounds is 3.

Asked in: JEE Advanced 2016 (Paper 1)

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