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MHT CET Chemistry question

ChemistryThe d and f-Block ElementsMHT CET

In which of the following pairs both the ions are coloured in aqueous solution? (At no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27) [CBSE PMT 2006, CBSE PMT (Pre.) 2010]

Answer: (C)

Solution

Colour needs unpaired d electrons: () and () are both coloured;

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Question ID VK-074722