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In which of the following octahedral complexes of cobalt (atomic number = 27) will represent low spin complex

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$[{CoCl}_{6}]^{3 -}$

$[Co {(H_{2} O)}_{6}]^{3 +}$

$[Co {({NH}_{3})}_{6}]^{3 +}$

$[Co {(CN)}_{6}]^{3 -}$

answer is D.

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Detailed Solution

It is given to find out which of the given octahedral complexes of cobalt (atomic number = 27)

The complex with a strong field ligand pairs up the electrons.

Explanation

Since cyanide ion is the strongest of all the ligands listed in the alternatives, $[Co {(CN)}_{6}]^{3 -}$ has the lowest value.

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