JEE Main 2024 Chemistry question

Chemistry The d and f-Block Elements JEE Main 2024

Number of colourless lanthanoid ions among the following is . Eu³⁺, Lu³⁺, Nd³⁺, La³⁺, Sm³⁺

Answer: 2

Solution

La³⁺ is [Xe]4f⁰ and Lu³⁺ is [Xe]4f¹⁴, so neither has unpaired electrons and both are colourless.

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Question ID VK-016534