The ligand inside the parenthesis in the formula of Mercury tetrathiocyanato-S cobaltate(III) is __________

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SCN

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NCS

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Solution

The correct option is B SCN
Here, the central metal atom is $C o$ and its oxidation state is +3.
It has 4 thiocyanide ligand.
When the ligands are polyatomic, its formula is enclosed in parenthesis.

Thiocyanide is an negative ambidentate ligand.
When thiocyanate ligand binds through 'S' atom it is named as "thiocyanato/thiocyanato-S"

When thiocyanate ligand binds through 'N' atom it is named as "Isothiocyanato/thiocyanato-N".

The charge on coordination entity will be -1.

Thus, the formula for the given compound is $H g [C o (S C N)_{4}] .$
Hence, option (b) is correct.

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