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.	$C{o}^{3+}$	i.	$\sqrt{8}B.M$
b.	$C{r}^{3+}$	11.	$\sqrt{35}B.M$
c.	$F{e}^{3+}$	iii.	$\sqrt{3}B.M$
d	$N{i}^{2+}$	iv	$\sqrt{24}B.M$
		v	$\sqrt{15}B.M$

• A. a - iii , b - v , c - i , d - ii
• B. a - iv , b - v , c - ii , d - i
• C. a - iv , b - i, c - ii , d - iii
• D. a - i , b - ii , c - iii , d - iv

Answer 1

Answer: (B)

$C{o}^{3+}=[Ar]3d^6$, Unpaired $e^{-}(n)=4$

Spin magnetic moment $=\sqrt{4(4+2)}=\sqrt{24}BM$

$C{r}^{3+}=[Ar]3d^3$, Unpaired $e^{-}(n)=3$

Spin magnetic moment $=\sqrt{3(3+2)}=\sqrt{15}BM$

$F{e}^{3+}=[Ar]3d^5$, Unpaired $e^{-}(n)=5$

Spin magnetic moment $=\sqrt{5(5+2)}=\sqrt{35}BM$

$N{i}^{2+}=[Ar]3d^8$, Unpaired $e^{-}(n)=2$

Spin magnetic moment $=\sqrt{2(2+2)}=\sqrt{8}BM$