Home › CBSE Class 12 (Science) › Chemistry › The d- and f-Block Elements › Which trivalent lanthanoid ions are colourless?
Which trivalent lanthanoid ions are colourless?
ALa3+ and Lu3+
BCe3+ and Nd3+
CPr3+ and Sm3+
DEu3+ and Tb3+
Answer & Solution
Correct answer: A. La3+ and Lu3+
La3+ has empty 4f and Lu3+ has full 4f14, so neither can show f-f absorption.
Related questions
Metals that readily form homogeneous alloys have radii within aboutMany copper(I) compounds in aqueous solution undergoSubstances that are attracted very strongly by a magnetic field are calledThe spin-only magnetic moment of Mn2+ (five unpaired electrons) is nearlyParamagnetism in transition metal ions arises from the presence ofTransition metals form many complexes owing to small ions, high charge andInterstitial compounds of transition metals are chemicallyCompounds formed when small atoms like H, C or N sit inside metal lattices are