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JEE Main Chemistry question

ChemistryThe d and f-Block ElementsJEE Main

How many of the following have 4 unpaired electrons? Cr^{2+},\ Co^{3+},\ Cu^{2+},\ Ni^{2+}

Answer: 2

Solution

(, high-spin) and (, high-spin) each have 4

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Question ID VK-147990