D-And F-Block Elements Ques 415

Question: Which of the following is paramagnetic

[Pb. CET 2000]

Options:

A) $ N{{i}^{++}} $

B) $ C{{u}^{+}} $

C) $ Z{{n}^{++}} $

D) $ S{{c}^{+++}} $

Show Answer

Answer:

Correct Answer: A

Solution:

Elements or ions containing unpaired electrons are paramagnetic.

$ _{28}Ni=[Ar]\ 3d^{8}4s_2^{{}} $ ; $ N{{i}^{2+}}=[Ar]\ 3d^{8}4s^{0} $

$ N{{i}^{2+}} $ Stage Because $ N{{i}^{2+}} $ have 2 unpaired electrons in 3d subshell therefore it is paramagnetic.



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