D-And F-Block Elements Ques 421

Question: The aqueous solution containing which one of the following ions will be colourless

[CBSE PMT 2000, 05]

Options:

A) $ S{{c}^{3+}} $

B) $ F{{e}^{2+}} $

C) $ T{{i}^{3+}} $

D) $ M{{n}^{2+}} $ (Atomic number Sc = 21, Fe = 26, Ti = 22, Mn = 25)

Show Answer

Answer:

Correct Answer: A

Solution:

$ _{21}Sc\to 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{1} $

$ S{{c}^{+3}}\to 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} $ Due to presence of paired electron it will be colourless.



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