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JEE Main20238 Apr 2023Morning ShiftChemistryCoordination CompoundsActual

Which of the following complex is octahedral, diamagnetic and the most stable?

Options

  1. ANa 3 [ CoCl 6 ]  
  2. BNi NH 3 6 Cl 2
  3. CK 3 Co ( CN ) 6
  4. DCo H 2 O 6 Cl 2

Correct answer

C. K 3 Co ( CN ) 6

Step-by-step solution

The coordination compound K 3 [ Co ( CN ) 6 ] contains a cobalt( III ) ion, which has a d 6 electronic configuration. The cyanide ligands in this complex are indeed strong field ligands, which means they will cause a large splitting of the d   orbitals. So here cobalt is in + 3 state having 3 d 6 configuration and also cyanide ligand which is a strong field ligand so, it is most stable and will have octahedral shape. The given compounds have the following nature: (1) Na 3 [ CoCl 6 ]   – Paramagnetic

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