D-And F-Block Elements Ques 405

Question: Which of the following species is expected to show the highest magnetic moment- (At. Nos.: Cr=24, Mn = 25, Co = 27, Ni = 28, Cu = 29)

[Kerala PMT 2004]

Options:

A) $ C{{r}^{2+}} $

B) $ M{{n}^{2+}} $

C) $ C{{u}^{2+}} $

D) $ C{{o}^{2+}} $

E) $ N{{i}^{2+}} $

Show Answer

Answer:

Correct Answer: B

Solution:

Highest magnetic moment depends upon number of unpaired electron since $ C{{r}^{2+}}=3d^{4}4s^{0} $ ,

$ M{{n}^{2+}}=3d^{5}4s^{0} $

$ C{{u}^{2+}}=3d^{9}4s^{0} $ ,

$ C{{o}^{2+}}=3d^{7}4s^{0} $ ,

$ N{{i}^{2+}}=3d^{6}4s^{0} $

So $ M{{n}^{2+}} $ contain maximum number of unpaired electron i.e. 5.



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक