The Δ₀ of [Cr (H₂ O)₆]³⁺, [CrF₆]³⁻ and [Cr(CN)₆]³⁻ follows the order: · ABC26IN0406

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

The $\Delta_{0}$ of $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$, $\left[\mathrm{CrF}_{6}\right]^{3-}$ and $\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$ follows the order:
(a)$\left[\mathrm{CrF}_{6}\right]^{3-}>\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$
(b)$\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}>\left[\mathrm{CrF}_{6}\right]^{3-}>\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$
(c)$\left[\mathrm{CrF}_{6}\right]^{3-}>\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}>\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$
(d)$\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}>\left[\mathrm{CrF}_{6}\right]^{3-}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Spectrochemical series: CN⁻ > H₂O > F⁻ (d).

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