Question

Match list I with list II and select the correct answer using codes given below the lists:

	List I Metal ion		List II Magnetic moment (BM)
A	${Cr}^{3+}$	1	$\sqrt{35}$
B	${Fe}^{2+}$	2	$\sqrt{30}$
C	${Ni}^{2+}$	3	$\sqrt{24}$
D	${Mn}^{2+}$	4	$\sqrt{15}$
		5	$\sqrt{8}$

• A. A-1, B-3, C-5, D-4
• B. A-2, B-3, C-5, D-1
• C. A-4, B-3, C-5, D-1
• D. A-4, B-5, C-3, D-1

Answer 1

Answer: (C)

A-4, B-3, C-5, D-1

For ${Cr}^{3+}=3d^3,$

$\mu =\sqrt{3(3+2)}=\sqrt{15}BM$

For ${Fe}^{2+}=3d^6,$

$\mu =\sqrt{4(4+2)}=\sqrt{24}BM$

For ${Ni}^{2+}=3d^8,$

$\mu =\sqrt{2(2+2)}=\sqrt{8}BM$

For ${Mn}^{2+}=3d^5,$

$\mu =\sqrt{5(5+2)}=\sqrt{35}BM$

Hence, option C is correct.