CdS, HgS and BiI₃ are coloured due to · ABC26IN1096
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Exam: CSIR NET JUNE 2017 · Marks: 2 · Difficulty: Easy
$\mathrm{CdS}, \mathrm{HgS}$ and $\mathrm{BiI}_{3}$ are coloured due to
(a)L→M charge transfer transitions
(b)d → d electronic transitions
(c)M→L charge transfer transitions
(d)combination of $\mathrm{L} \rightarrow \mathrm{M}$ charge transfer and $\mathrm{d} \rightarrow \mathrm{d}$ electronic transitions
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
CdS, HgS and BiI₃ have d¹⁰/s² metal centres with no d–d transitions; their colour is S²⁻/I⁻ → metal charge transfer.
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