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JEE Main 2014 · 6 Apr · Shift 1, Chemistry question 43

The octahedral complex of a metal ion MX3+\ce{M^3+} with four monodentate ligands L1L_1, L2L_2, L3L_3 and L4L_4 absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is :

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Answer and worked solution

Official answer: B

A larger splitting means higher-energy light is absorbed. The energy order is red < yellow < green < blue, so the ligand strengths are
L1 (red)<L3 (yellow)<L2 (green)<L4 (blue).L_1\,(\text{red})<L_3\,(\text{yellow})<L_2\,(\text{green})<L_4\,(\text{blue}).

Topics:Crystal field theoryMagnetic properties and colour
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