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Question

The co-ordination number of a central metal atom in a complex is determined by ___________.

A
the number of ligands around a metal ion bonded by sigma bonds
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B
the number of ligands around a metal ion bonded by pi-bonds
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C
the number of ligands around a metal ion bonded by sigma and pi-bonds both
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D
the number of only anionic ligands bonded to the metal ion
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Solution

The correct option is A the number of ligands around a metal ion bonded by sigma bonds
The co-ordination number of a central metal atom in a complex is determined by the number of ligands around a metal ion bonded by sigma bonds. It is also define as the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbors in a complex. For example, in Ni(CO)4, four carbonyl ligands are bonded to Ni atom. Hence, the coordination number of Ni in Ni(CO)4 is four.

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