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Question
Trivalent Lanthanoid ions such as La3+ (Z = 57) and Lu3+ (Z = 71) do not show any colour in their solution. Give a reason.
Short/Brief Note
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Solution
Many trivalent lanthanide ions are coloured in both solid and liquid forms because their f-orbitals are not fully filled. Lu+3 and La+3 are colourless in liquid form because they do not have any unpaired electrons.
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