JEE MAIN - Chemistry (2019 - 9th January Evening Slot - No. 20)

The complex that has highest crystal field splitting energy ($$\Delta $$), is :
[Co(NH3)5(H2O)]Cl3
K2[CoCl4]
[Co(NH3)5Cl]Cl2
K3[Co(CN)6]

Explanation

As complex K3[Co(CN)6] have CN$$-$$ ligand which is strongfield ligand amongst the given ligands in other complexes.

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