No. of unpaired electron in K2NiF6 is Zero .any one can give reason plz?

IIT JAM Question

By Arpit Shukla · Feb 06, 2018 ·IIT JAM
4 Answers
Muhsin Punnoli answered Feb 06, 2018
Normally Nickel is +2 or +3 but here is +4 when unit increase of positive charge there is 40 to 50% increase in splitting energy Hence it show Low spin state

Darshana Deb answered Feb 06, 2018
Ni is in d6 state which gains maximum cfse in lowspin state. But you have F as the ligand which has very low ligand field strength. So F has a tendency to contradict but it is overpowered as Zeff over Ni is quite high and increases the spliting parameter making it a lowspin complex

Vinod Gopal answered Mar 19, 2019
In K2NiF6 , Ni is in +4 state but normally nickel is +3/ +2 charges so there is increase in positive charges which leads to increases chance of splitting thereby causing lie spin.

Monesh answered Feb 09, 2018
I think its K2NiF6 2(-)

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