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The tetrahedral complexes are...

The tetrahedral complexes are

A

`Ni(CO)_(4)`

B

`[FeCl_(4)]^(-1)`

C

`[MnCl_(4)]^(2-)`

D

`[CoCl_(4)]^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
a,b,c,d
(A):`Ni(O):3d^(10)`, (B): `Fe^(3+):3d^(5)` (C) `Mn^(2+):3d^(5)`, (D) `Co^(2+):3d^(7)`. All have `sp^(3)` hybridization.
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Nearly all tetrahedral complexes are

Assertion (A) : Low spin tetrahedral complexes are rarely observed. Reason (R) : Crystal field splitting is less than pairing energy for tetrahedral complexes.

(a) What type of isomerism is shown by the complex [Co(NH_(3))_(5)(SCN)]^(2+) ? (b) why is [NiCl_(4)]^(2-) paramagnetic while [Ni(CN)_(4)]^(2-) is diamagnetic ? (Atomic number of Ni=28) (c) Why are low spin tetrahedral complexes rarely observed?

Statement-1: All tetrahedral complexes are mainly high spin and the low spin configurations are rarely observed. Statement-2: Delta_(t) is always much smaller even with stronger field ligands and it is never energetically favourable to pair up the electrons.