The VO₄³⁻, CrO₄²⁻ and MnO₄⁻ ion exhibit intense ligand to metal charge transfer transition. The wavelengths… · ABC26IN0388

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

The $\mathrm{VO}_{4}^{3-}$, $\mathrm{CrO}_{4}^{2-}$ and $\mathrm{MnO}_{4}^{-}$ ion exhibit intense ligand to metal charge transfer transition. The wavelengths of this transition follow the order
(a)$\mathrm{CrO}_{4}^{2-}<\mathrm{VO}_{4}^{3-}<\mathrm{MnO}_{4}^{-}$
(b)$\mathrm{MnO}_{4}^{-}<\mathrm{VO}_{4}^{3-}<\mathrm{CrO}_{4}^{2-}$
(c)$\mathrm{VO}_{4}^{3-}<\mathrm{CrO}_{4}^{2-}<\mathrm{MnO}_{4}^{-}$
(d)$\mathrm{CrO}_{4}^{2-}<\mathrm{MnO}_{4}^{2-}<\mathrm{VO}_{4}^{3-}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
The LMCT energy falls as the metal's oxidation state rises (V⁵⁺ < Cr⁶⁺ < Mn⁷⁺ in oxidising power). MnO₄⁻ absorbs near 528 nm, CrO₄²⁻ near 373 nm and VO₄³⁻ in the UV. Wavelength order VO₄³⁻ < CrO₄²⁻ < MnO₄⁻ (c).

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