A filter paper moistened with cadmium acetate solution turns yellow upon exposure to H₂ S. The transition… · ABC26IN0629
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Compounds – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
A filter paper moistened with cadmium acetate solution turns yellow upon exposure to $\mathrm{H}_{2} \mathrm{S}$. The transition responsible for the yellow colour is
(a)d-d
(b)metal to ligand charge transfer
(c)ligand to metal charge transfer
(d)$\sigma-\sigma^{*}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
CdS (Cd²⁺ d¹⁰) is yellow from S²⁻ → Cd²⁺ ligand-to-metal charge transfer (c).