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1
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
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 _______________.
2
JEE Main 2021 (Online) 20th July Morning Shift
Numerical
+4
-1
The spin-only magnetic moment value for the complex [Co(CN)6]4$$-$$ is __________ BM.

[At. no. of Co = 27]
3
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
The total number of unpaired electrons present in the complex K3[Cr(oxalate)3] is _____________.
[Ti(H2O)6]3+ absorbs light of wavelength 498 nm during a d $$-$$ d transition. The octahedral splitting energy for the above complex is ____________ $$\times$$ 10$$-$$19 J. (Round off to the Nearest Integer). h = 6.626 $$\times$$ 10$$-$$34 Js; c = 3 $$\times$$ 108 ms$$-$$1