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Bond Pairs and Lone Pairs

Which of the ...

Question

Which of the following complexes are diamagnetic ?

A

[AuCl

_{4}

]

^{-}

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B

[Co(H

_{2}

O)

_{6}

]

^{3 +}

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C

[CoF

_{6}

]

^{3 -}

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D

[Co(CO)

_{4}

]

^{-}

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Solution

The correct options are
A [AuCl $_{4}$ ] $^{-}$
B [Co(H $_{2}$ O) $_{6}$ ] $^{3 +}$
D [Co(CO) $_{4}$ ] $^{-}$
[AuCl $_{4}$ ] $^{-}$
$A u^{+ 3} = d^{8}$ configuration so it will not have any unpaired electron
[Co(H $_{2}$ O) $_{6}$ ] $^{3 +}$
$C o^{+ 3} = d^{6} d^{2} s p^{3}$ hybridization so it doesnt have unpaired electron
Co(CO) $_{4}$ ] $^{-}$
$d^{8} d s p^{2}$ hybridization so it doesnt have unpaired electron.
As they all have no unpaired electron so they all are diamagnetic.

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Similar questions

Q. How many given complexes are diamagnetic out of following?
[AuCl

_{4}

^{-}

_{2}

_{6}

^{3 +}

_{4}

^{-}

.

Q. Among the following complexes, the diamagnetic complexes are:

(K) : K_{3} [F e (C N)_{6}]

(L) : [C o (N H_{3})_{6}] C l_{3}

(M) : N a_{3} [C o (o x a l a t e)_{3}]

(N) : [N i (H_{2} O)_{6}] C l_{2}

(O) : K_{2} [P t (C N)_{4}]

(P) : [Z n (H_{2} O)_{6}] (N O_{3})_{2}

_{2}

_{6}

^{3 +}

Q. Consider the following two complex ions :

{[C o F_{6}]}^{3 -}

{[C o {(C_{2} O_{4})}_{3}]}^{3 -}

. Which of the following statement(s) is/are false?
I. Both are octahedral.
II.

{[C o {(C_{2} O_{4})}_{3}]}^{3 -}

is diamagnetic while

{[C o F_{6}]}^{3 -}

is paramagnetic.
III. Both are outer orbital complexes.
IV. In both the complexes, the central metal is in the same oxidation state.

Give the electronic configuration of the following complexes on the basis of crystal field splitting theory. $[C o F_{6}]^{3 -}, [F e (C N)_{6}]^{4 -}$ and $[C u (N H_{3})_{6}]^{2 +} .$

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