NEET | 2018d and f-Block ElementsHard

Question

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
 Column I         Column II
a. Co3+           i.8  B.M.
b. Cr3+           ii.35  B.M.
c. Fe3+          iii.3 B.M.
d. Ni2+           iv. 24 B.M.
                     v. 15 B.M.
       

Options

A.

a    b    c     d

iv    v     ii     i

B.

a    b    c     d

i      ii    iii    iv

C.

a    b    c     d

iv    i     ii    iii

D.

a    b    c     d

iii    v     i     ii

Solution

Magnetic moment=n+(n+2)   B.M.
(a)  Co3+ →1s2 2s2 2p6 3s2 3p6 4s0 3d6
                

                                    n = 4
μ=4(4+2)=24       B. M
(b) Cr+3 → 1s2 2s2 2p6 3s2 3p6 4s0 3d3
                                       
                                                    
n = 3
μ=3(3+2)=15    
(c) Fe+3 → 1s2 2s2 2p6 3s2 3p6 4s0 3d5
                                   
                                                     
n = 5
μ=5(5+2)=35    
(d) Ni+3 → 1s2 2s2 2p6 3s2 3p6 4s0 3d8
                                       
                                                               
n = 2
μ=2(2+2)=8    
                                                  
 

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