Question

Match List-I with List-II.

	List-I		List-II
(a)	$\left[Fe\right(CN{)}_6{]}^{3-}$	(i)	5.92 BM
(b)	$\left[Fe\right(H_{2}O{)}_6{]}^{3+}$	(ii)	0 BM
(c)	$\left[Fe\right(CN{)}_6{]}^{4-}$	(iii)	4.90 BM
(d)	$\left[Fe\right(H_{2}O{)}_6{]}^{2+}$	(iv)	1.73 BM

Choose the correct answer from the options given below.

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

Answer 1

The correct option is A (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

Magnetic moment, $\mu =\sqrt{n(n+2)}BM$ (where n = number of unpaired electrons)

	Complex	No. of unpaired electron(s)	$\mu \left(BM\right)$
(a)	$\left[Fe\right(CN{)}_6{]}^{3-}$	1	1.73
(b)	$\left[Fe\right(H_{2}O{)}_6{]}^{3+}$	5	5.92
(c)	$\left[Fe\right(CN{)}_6{]}^{4-}$	0	0
(d)	$\left[Fe\right(H_{2}O{)}_6{]}^{2+}$	4	4.90