There are four complexes of Ni. Select the complexes/es which will be attracted by magnetic field:

(I) ${[N i {(C N)}_{4}]}^{2 -}$ (II) ${[N i C l_{4}]}^{2 -}$ (III) $[N i {(C O)}_{4}]$ (IV) ${[N i {(N H_{3})}_{6}]}^{2 +}$

Question

There are four complexes of Ni. Select the complexes/es which will be attracted by magnetic field: (I) N i C N 4 2 - (II) N i C l 4 2 - (III) N i C O 4 (IV) N i N H 3 6 2 +

TestHub · Accepted Answer

Only N i C l 4 2 - and N i N H 3 6 2 + are paramagnetic so will be attracted in magnetic field. Complex O.S HBZ Geometry Unpaired Magnetic property N i C l 4 2 - +2 s p 3 Tetrahadral 2 Paramagnetic N i C N 4 2 - +2 d s p 2 Square planar 0 Diamagnetic N i C O 4 0 s p 3 Tetrahadral 0 Diamagnetic N i N H 3 6 2 + +2 s p 3 d 2 Octahedral 2 Paramagnetic

Chemistry - Coordination Chemistry Question with Solution | TestHub

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Doubts & Discussion

Complex	O.S	HBZ	Geometry	Unpaired	Magnetic property
${[N i C l_{4}]}^{2 -}$	+2	$s p^{3}$	Tetrahadral	2	Paramagnetic
${[N i {(C N)}_{4}]}^{2 -}$	+2	$d s p^{2}$	Square planar	0	Diamagnetic
$[N i {(C O)}_{4}]$	0	$s p^{3}$	Tetrahadral	0	Diamagnetic
${[N i {(N H_{3})}_{6}]}^{2 +}$	+2	$s p^{3} d^{2}$	Octahedral	2	Paramagnetic