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JEE Advanced Chemistry question

ChemistryThe d and f-Block ElementsJEE Advanced

How many of the following are paramagnetic as well as coloured species? , , , , , , ,

Answer: 6

Solution

is paramagnetic (two unpaired electrons in its MOs) and famously pale blue as a liquid (demonstrated by the classic experiment of pouring liquid between magnet poles). is an odd-electron radical (paramagnetic) and is brown. () is paramagnetic and blue. (,

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Question ID VK-159943