[ C r ( N H 3 ) 6 ] 3 + is paramagnetic while [ N i ( C N ) ...

NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

Question : 19 of 43

Marks: +1, -0

[Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2– is diamagnetic. Explain why?

Solution:

[Cr ( NH3)6]3+:Cr(24):[Ar]4s13d5,
Cr3+(21):[ Ar]4s03d3

is paramagnetic due to presence of unpaired electrons
[Ni(CN)4]2−:Ni(28):4s23d8,
Ni2+:4s03d8

It has square planar shape and is diamagnetic due to absence of unpairedelectrons.

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