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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
An ion $M^{2+}$, forms the complexes $[M(H_2O)_6]^{2+} , [M(en)_3]^{2+}$ and  $[MBr_6]^{4-}$ , match the complex with the appropriate colour
  • A
    Green, blue and red
  • B
    Red, blue and green
  • C
    Green, red and blue
  • ✓
    Blue, red and green
✓

Answer

Correct option: D.
Blue, red and green
d
$\Delta_0$ value is directly proportional to energy and inversely related to the wavelength. Also, more the ligand is a strong field ligand More will be the value of $\Delta_{\circ}$ and lower will be its wavelength. Among the given complexes the strength of ligands are $Br ^{-}< H _2 O <$ en.Since the emitted colours are red, green, blue the absorbed colours must be green,red,orange. Hence the compound $\left[ M \left( H _2 O \right)_6\right]^{2+},\left[ M ( en )_3\right]^{2+},\left[ M ( Br )_6\right]^{4-}$ are blue red and green respectively.

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