The lanthanide ion the exhibits color in aqueous solution is · ABC26IN0428
Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Lanthanide And Actinide – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy
The lanthanide ion the exhibits color in aqueous solution is
(a)La (III)
(b)Eu (III)
(c)Gd (III)
(d)Lu (III)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
La³⁺ (f⁰), Gd³⁺ (f⁷, next level far above) and Lu³⁺ (f¹⁴) have no accessible f→f transitions and are colourless; Eu³⁺ (f⁶) is faintly pink.
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