NEET 2010 Chemistry question

Which of the following ions will exhibit colour in aqueous solutions?

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

Colour of transition-metal ions arises from - (or -) transitions and needs unpaired electrons in a partially filled subshell. (): one unpaired electron, so it is coloured

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Question ID VK-090521