The red colour of ruby is due to · ABC26IN0641
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Compounds – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Easy
The red colour of ruby is due to
(a)d-d transition of $\mathrm{Cr}^{3+}$ ion in $\mathrm{Cr}_{2} \mathrm{O}_{3}$ lattice
(b)d-d transition of $\mathrm{Cr}^{3+}$ ion in $\mathrm{Al}_{2} \mathrm{O}_{3}$ lattice
(c)ligand to metal charge transfer transition
(d)metal to metal charge transfer transition
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Ruby is Cr³⁺ doped in Al₂O₃; the compressed sites shift the d–d bands, giving red (b).
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