Match list I with list II and select the correct answer using the codes givenn below the lists.
List I : Metal ions `" "` List II : Magnetic moment (BM)
1. `" "Cr^(3+)" A. "sqrt(35)`
2. `" "Fe^(2+)" B. "sqrt(30)`
3. `" "Ni^(2+)" C. "sqrt(24)`
4. `" "Mn^(2+)" D. "sqrt(15)`
`" " E." "sqrt(8)`
Codes :

Options

A. 1-A, 2-C, 3-E, 4-D
B. 1-B, 2-C, 3-E, 4-A
C. 1-D, 2-C, 3-E, 4-A
D. 1-D, 2-E, 3-C, 4-A

Answer

C

Explanation

`because mu=sqrt(n(n+2))`
`Cr^(3+)(Z=24):3d^(3)4s^(0), mu=sqrt(3(3+2))=sqrt(15)`
`Fe^(2+)(Z=26):3d^(6)4s^(0), mu=sqrt(4(4+2))=sqrt(24)`
`Ni^(2+)(Z=28):3d^(8)4s^(0), mu=sqrt(2(2+2))=sqrt(8)`
`Mn^(2+)(Z=25)=3d^(5)4s^(0), mu=sqrt(5(5+2))=sqrt(35)`