JEE Advanced Chemistry question

Colour of transition metal ions are due to

(A)Variable valency
(B)d-d transitionCorrect
(C)Incompletely filled d-orbitalsCorrect
(D)Charge transferCorrect

Answer: (B),(C),(D)

Solution

The characteristic colours of transition-metal ions arise mainly from d-d transitions (b) — electrons being excited between split d-orbitals (crystal-field splitting) — which is only possible because the d-subshell is incompletely filled (c); a filled () or empty () d-subshell gives colourless ions. In

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Question ID VK-159599