The absorption of ${[C o {(N H_{3})}_{6}]}^{2 +}$ is

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Weaker than that of ${[M n C l_{4}]}^{2 -}$ but stronger than that of ${[C o {(N H_{3})}_{5} C l]}^{2 +}$

Weaker than those of both ${[M n C l_{4}]}^{2 -}$ and ${[C o {(N H_{3})}_{5} C l]}^{2 +}$

Stronger than that of ${[M n C l_{4}]}^{2 -}$

Weaker than that of ${[C o {(N H_{3})}_{5} C l]}^{2 +}$

answer is A, B.

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Detailed Solution

Since ammonia is stronger ligand $Δ_{0}$ is more than $Δ_{t}$ . Further with increase in the number of charges on $C o^{3 +}$ in ${[C o {(N H_{3})}_{5} C l]}^{2 +} . Δ_{0}$ is more in ${[C o {(N H_{3})}_{6}]}^{2 +}$ than in ${[C o {(N H_{3})}_{5} C l]}^{2 +}$ . So absorption of energy is more in than ${[C o {(N H_{3})}_{6}]}^{2 +}$ and ${[M n C l_{4}]}^{2 -}$