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Coordination Compounds

Question
CBSEENCH12010658
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The octahedral complex of a metal ion M3+ with four Monodentate Ligands, L1, L2, L3 and L4 absorb wavelengths in the region of red, green, yellow and blue respectively. The increasing order of ligand strength of the four ligands is

  • L4< L3<L2<L1

  • L1<L3<L2<L4

  • L3<L2<L4<L1

  • L1<L2<L4<L3

Solution

B.

L1<L3<L2<L4

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λ L1 L2 L3 L4
Absorbed light Red Green Yellow Blue
the wavelength of absorbed light decreases

Therefore, increasing order of energy of wavelengths abosrbed reflects greater extent of crystal - field splitting, hence higher field strength of the ligand.
Energy: Blue(L4)> Green (L2)> Yellow (L3) > Red (L1)

Some More Questions From Coordination Compounds Chapter

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Calculate the overall complex dissociation equilibrium constant for the Cu(NH3)42+ion, given β4 for this complex is 2.1 x 1013.

Identify the ligands from the following coordination compounds:
(a)    [Co(en)2Cl(NO2)2]
(b)    K[Co(CN)(CO2)(NO)]
(c)    K3[Al(OH)6]
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(b)    [Cu(en)2(NO3)2

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