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  4. Assertion: Co[Hg(SCN)6] and Hg [Co(SCN)6] are isomers. Reason: SCN- is a stronger ligand as compared to NCS-.

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Q. Assertion: $Co[Hg(SCN)_6]$ and Hg $[Co(SCN)_6]$ are isomers.
Reason: $SCN^-$ is a stronger ligand as compared to $NCS^-$.

AIIMSAIIMS 2016Coordination Compounds

Solution:

Co[Hg(SCN)6] and Hg[Co(SCN)6] are ionisation isomers. NCS- is stronger than SCN-.