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JEE Main Chemistry question

ChemistryThe d and f-Block ElementsJEE Main

How many of the following are paramagnetic as well as coloured species? O_2, NO_2, Cu^{2+}, Hg^{2+}, Fe^{2+}, Fe^{3+}, [Fe(CN)_6]^{4-}, [Fe(CN)_6]^{3-}

Answer: 5

Solution

(odd-electron, brown), blue), high spin, pale green) and yellow-brown) are each paramagnetic and coloured; (low-spin , one unpaired electron, red) is likewise paramagnetic and coloured. By

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Question ID VK-147495