JEE MAIN - Chemistry (2021 - 20th July Evening Shift - No. 23)
An aqueous solution of NiCl2 was heated with excess sodium cyanide in presence of strong oxidizing agent to form [Ni(CN)6]2$$-$$. The total change in number of unpaired electrons on metal centre is _______________.
Answer
2
Explanation
[Ni(CN)6]2-
Ni+4 $$\to$$ d6, CN- strong field ligand. So pairing will happen.
_20th_July_Evening_Shift_en_23_3.png)
Here zero unpaired electron
NiCl2 $$\to$$ Ni2+ $$\to$$ d8
_20th_July_Evening_Shift_en_23_4.png)
Cl- Weak field ligand.$$\to$$ two unpaired e-
$$ \therefore $$ Change = 2.
Ni+4 $$\to$$ d6, CN- strong field ligand. So pairing will happen.
Here zero unpaired electron
NiCl2 $$\to$$ Ni2+ $$\to$$ d8
Cl- Weak field ligand.$$\to$$ two unpaired e-$$ \therefore $$ Change = 2.
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