Q28 / 214 · NTA Abhyas (NEET) 2020 · Chemistry · Coordination Compounds

Which of the following specie is diamagnetic in nature?

A
${[Cr {({NH}_{3})}_{6}]}^{3 +}$
Correct answer
B
${[Fe {({NH}_{3})}_{6}]}^{2 +}$
C
${[Co {(H_{2} O)}_{6}]}^{+ 2}$
D
$[N i F_{6}]^{4 -}$

Solution

	Complex ions	Unpaired electron (n)	$μ_{e f f}$ (in B.M.) $= \sqrt{n (n + 2)}$
$A .$	${[Cr {({NH}_{3})}_{6}]}^{3 +}$	$3$	$3.87$
$B .$	${[Fe {({NH}_{3})}_{6}]}^{2 +}$	$0$	$0$
$C .$	${[Co {(H_{2} O)}_{6}]}^{+ 2}$	$3$	$3.87$
$D .$	$[N i F_{6}]^{4 -}$	$2$	$2.8$

Hence, the correct answer is option: 'B'.

More Coordination Compounds Questions