Question

25. Which of the following is a square planar complex?
(1) [NICI4]2-
(2) [PtBr4]2-
(3) [ZnBr4]2-
(4) [Au(CN)]2-
plz explain it well...........​

Answer 1

Correct Question :-

Which of the following is a square planar complex?

(1) [NICI4]²-

(2) [PtBr4]²-

(3) [ZnBr4]²-

(4) [Ni(CN)4]²- ✔

To Find :-

• Which of the following complex has square planar structure ?

Explaination :-

Q1)

$\mathsf {[NiCl_{4}] {}^{2 - } }$

Calculation of O.N. :-

→ x - 1×4 = -2

→ x = -2 + 4

→ x = 2

$\mathsf{Electronic \: configuration \: of \: Ni } \\ \mathsf{</p><p>[Ar] 4s {}^{2} 3d {}^{8} }$

Then,

$\mathsf{Electronic \: configuration \: of \: Ni {}^{2 + } } \\ \mathsf{[Ar] 3d {}^{8} }$

Orbital diagram :-

( Refer to the attachment. )

Hence,

Hybridisation = sp³

Q2)

$\mathsf{[PtBr_{4}] {}^{2 - } }$

Calculation of O.N. :-

→ x - 1×4 = -2

→ x = -2 + 4

→ x = 2

$\mathsf{Electronic \: configuration \: of \: Pt} \\ </p><p> \mathsf{[Xe]4f {}^{14}5d {}^{9} 6s {}^{1} }$

Then,

$\mathsf{Electronic \: configuration \: of \: Pt {}^{2 + } } \\ \mathsf{[Xe] 4f {}^{14} 5d {}^{8} }$

Orbital diagram :-

( Refer to the attachment. )

Hence,

Hybridisation = sp³

Q3)

$\mathsf{[ZnBr_{4}] {}^{2 - } }$

Calculation of O.N. :-

→ x - 1×4 = -2

→ x = -2 + 4

→ x = 2

$\mathsf{Electronic \: configuration \: of \: Zn} \\ </p><p> \mathsf{[Ar] 4s {}^{2} 3d {}^{10} }$

Then,

$\mathsf{Electronic \: configuration \: of \: Zn {}^{2 + } }</p><p> \\ \mathsf{[Ar] 3d {}^{10} }$

Orbital diagram :-

( Refer to the attachment. )

Hence,

Hybridisation = sp³

Q4)

$\mathsf{[NiCN_{4}] {}^{2 - } }$

Calculation of O.N. :-

→ x - 1×4 = -2

→ x = -2 + 4

→ x = 2

$\mathsf{Electronic \: configuration \: of \: Ni}</p><p> \\ \mathsf{[Ar] 4s {}^{2} 3d {}^{8} }$

Then,

$\mathsf{Electronic \: configuration \: of \: Ni {}^{2 + } }</p><p> \\ \mathsf{[Ar] 3d {}^{8} }$

Orbital diagram :-

( Refer to the attachment. )

Hence,

Hybridisation = dsp²

Therefore,

Option D is correct.

Note :-

• $\mathsf{CN {}^{-}}$ is a strong field ligan and as it approaches the metal ion, the electron must pair up.

Answer 2

Answer:

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