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  4. Which of the following species is not expected to be a ligand?

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Q. Which of the following species is not expected to be a ligand?

Coordination Compounds

Solution:

Complexes are formed when ligands donate a pair of electrons to metals. In ammonia, $N$ atom has one lone pair of electrons. Nitrogen donates this lone pair of electrons to proton to form ammonium ion. So $N H _{4}^{+}$ ion does not have a lone pair of electrons which it can donate to central metal ion. Hence it cannot behave as a ligand.