The colour of the coordination compound depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes ${[C o {(N H_{3})}_{6}]}^{3 +}, {[C o {(C N)}_{6}]}^{3 -}, {[C o {(H_{2} O)}_{6}]}^{3 +}$

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${[C o {(N H_{3})}_{6}]}^{3 +} > {[C o {(H_{2} O)}_{6}]}^{3 +} > {[C o {(C N)}_{6}]}^{3 -}$

${[C o {(N H_{3})}_{6}]}^{3 +} > {[C o {(C N)}_{6}]}^{3 -} > {[C o {(H_{2} O)}_{6}]}^{3 +}$

${[C o {(H_{2} O)}_{6}]}^{3 +} > {[C o {(N H_{3})}_{6}]}^{3 +} > {[C o {(C N)}_{6}]}^{3 -}$

${[C o {(C N)}_{6}]}^{3 -} > {[C o {(N H_{3})}_{6}]}^{3 +} > {[C o {(H_{2} O)}_{6}]}^{3 +}$

answer is D.

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Detailed Solution

Field strength of ligands $C N^{-} > N H_{3} > H_{2} O$

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