JEE Advanced 2025 Chemistry question

The pair(s) of diamagnetic ions is(are)

Answer: (A),(B)

Solution

Diamagnetic ions have no unpaired electrons. La³⁺ and Ce⁴⁺ are both [Xe]4f⁰ (A). Yb²⁺ and Lu³⁺ are both [Xe]4f¹⁴ (B). La²⁺ (5d¹),

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Question ID VK-037825