Question: 87. Given below are two statements:
Statement I : \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} is a homoleptic complex whereas \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}is a heteroleptic complex.
Statement II : Complex \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} has only one kind of ligands but \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+} has more than one kind of ligands.
In the light of the above statements, choose the correct answer from the options given below.
(1) Both Statement I and Statement II are true.
(2) Both Statement I and Statement II are false.
(3) Statement I is true but Statement II is false.
(4) Statement I is false but Statement II is true.
Answer: Option (1)
Explanation:
A homoleptic complex is one in which the central metal ion is bonded to only one type of ligand.
In the complex \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+},
all six ligands are ammonia, so it is a homoleptic complex.
A heteroleptic complex contains more than one type of ligand.
In the complex \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+},
there are two different ligands, ammonia and chloride, so it is a heteroleptic complex.
Statement II correctly explains the reason for the classification given in Statement I.
Therefore, both Statement I and Statement II are true.