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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 32
Total: 43
What will be the correct order for the wavelengths of absorption in the visible region for the following :
[Ni(NO2)6]4− ,[Ni(NH3)6]2+,[Ni(H2O)6]2+?
Solution:  
In spectrochemical series the order of the given ligands isH2O<NH3<NO2–. Hence, the wave length of light will be absorbedin the opposite order since E=
hc
λ
 .
Hence, the order of absorption of light will be
[Ni(NO2)6]4− < [Ni(NH3)6]2+ < [Ni(H2O)6]2+.
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