Question

Match list I (Complex ions) with list II (number of unpaired electrons) and select the correct answers:

	List I		List II
A	$[Cr{F}_6{]}^{4-}$	1	One
B	$[Mn{F}_6{]}^{4-}$	2	two
C	$\left[Fe\right(CN{)}_6{]}^{4-}$	3	zero
D	$\left[Mn\right(CN{)}_6{]}^{4-}$	4	four
		5	five

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

Answer 1

Answer: (C)

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

(A) The complex ion $[Cr{F}_6{]}^{4-}$ contains four unpaired electrons.
(B) The complex ion $[Mn{F}_6{]}^{4-}$ contains five unpaired electrons.
(C) The complex ion $\left[Fe\right(CN{)}_6{]}^{4-}$ contains zero unpaired electrons.
(D) The complex ion $\left[Mn\right(CN{)}_6{]}^{4-}$ contains one unpaired electrons.