Number of colourless lanthanoid ions among the following is _________. Eu3+, Lu3+, Nd3+, La3+, Sm3+ — JEE Mains Chemistry Past Papers Chemistry Question
Question
Number of colourless lanthanoid ions among the following is _________. Eu3+, Lu3+, Nd3+, La3+, Sm3+
Answer: .
💡 Solution & Explanation
La+3 – [Xe]4f0 Nd+3 – [Xe]4f3 Sm+3 – [Xe]4f5 Eu+3 – [Xe]4f6 Lu+3 – [Xe]4f14 La+3 and Lu+3 do not show any colour because no unpaired electron is present.
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