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NEET Medium

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 :

A

(1) iv, i, ii, iii

B

(2) i, ii, iii, iv

C

(3) iv, v, ii, i

D

(4) iii, v, i, ii

Step-by-Step Solution

Co3+=[Ar]3d6Co^{3+} = [Ar] 3d^6, Unpaired e−(n)=4e^-(n) = 4. Spin magnetic moment = 4(4+2)=24BM\sqrt{4(4+2)} = \sqrt{24} BM. Cr3+=[Ar]3d3Cr^{3+} = [Ar] 3d^3, Unpaired e−(n)=3e^-(n) = 3. Spin magnetic moment = 3(3+2)=15BM\sqrt{3(3+2)} = \sqrt{15} BM. Fe3+=[Ar]3d5Fe^{3+} = [Ar] 3d^5, Unpaired e−(n)=5e^-(n) = 5. Spin magnetic moment = 5(5+2)=35BM\sqrt{5(5+2)} = \sqrt{35} BM. Ni2+=[Ar]3d8Ni^{2+} = [Ar] 3d^8, Unpaired e−(n)=2e^-(n) = 2. Spin magnetic moment = 2(2+2)=8BM\sqrt{2(2+2)} = \sqrt{8} BM.

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