Home › Bihar Board Class 12 (Science) › Chemistry › d- and f-Block Elements › Which pair of trivalent lanthanoid-series ions i…
Which pair of trivalent lanthanoid-series ions is colourless?
ANd3+ and Sm3+
BEu3+ and Er3+
CCe3+ and Pr3+
DLa3+ and Lu3+
Answer & Solution
Correct answer: D. La3+ and Lu3+
La3+ (4f0) and Lu3+ (4f14) have no possible f-f transitions, so they show no colour.
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