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Q.

Which of the following complex absorbs light of maximum wavelength?

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a

${[M {({NH}_{3})}_{6}]}^{+3}$

b

${[M {(CN)}_{6}]}^{- 3}$

c

${[M {(H_{2} O)}_{6}]}^{+3}$

d

${[M {({NO}_{2})}_{6}]}^{- 3}$

answer is B.

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Detailed Solution

Based on spectrochemical series field strength of CN^- > ${NO}_{2}^{-}$ >NH₃>H₂O. A weak field ligand absorbs longest wavelength of light.

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