A) the number of ligands around a metal ion bonded by sigma bonds
B) the number of ligands around a metal ion bonded by pi-bonds
C) the number of ligands around a metal ion bonded by sigma and pi-bonds both
D) the number of only anionic ligands bonded to the metal ion
Correct Answer: A
Solution :
Co-ordination number is the maximum covalency shown by a metal or metal ion. It is the maximum number of ligands attached to metal by sigma bonds or co-ordinate bonds.
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