Q42 · CSIR NET Chemistry, June 2013
Paper: CSIR NET June 2013 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Marks: 2 · Difficulty: Medium
Three bands in the electronic spectrum of $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ are due to the following transitions (A) $^{4}\mathrm{A}_{2g}\rightarrow{}^{4}\mathrm{T}_{1g}$ (B) $^{4}\mathrm{A}_{2g}\rightarrow{}^{4}\mathrm{T}_{2g}$ (C) $^{4}\mathrm{A}_{2g}\rightarrow{}^{2}\mathrm{E}_{g}$ Identify the correct statement about them
(a)Intensity of (A) is lowest
(b)Intensity of (C) is lowest
(c)Intensities of (A), (B) and (C) are similar
(d)Intensities of (B) and (C) are similar
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
⁴A₂g→²Eg is spin-forbidden and so very weak. The other two are spin-allowed (Laporte-forbidden) bands of similar intensity (b).
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