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Byju's Answer

Standard XII

Chemistry

CFSE Comparison

Assertion :Af...

Question

Assertion :After splitting of d-orbitals during complex formation, the orbitals form two sets of orbitals $t_{2 g}$ and $e_{g}$ octahedral field. Reason: Splitting of d-orbitals occurs only in the case of strong field ligands Such as $C N^{-}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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The Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C The Assertion is correct but Reason is incorrect
Assertion is a true reason is false.
There will be repulsion between electrons in d-orbital of metal atom and a lone pair of electrons of ligands. This repulsion will be greater when these d-orbital of metal are directed towards the ligands than when there d-orbital are away from the ligand.The d $_{x^{2} - y^{2}}$ and d $_{z^{2}}$ orbitals of a metal atom will experience maximum repulsion. While d $_{x y}$ , d $_{y z}$ and d $_{x z}$ orbitals suffers minimum repulsion. This causes splitting of the d-orbitals.

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Similar questions

Q. Assertion :According to crystal field theory, during complex formation, the d - orbitals split and form two sets of orbitals

t_{2 g}

and

e_{g}

Reason: Splitting of d - orbitals occurs only in case of strong field ligand

Statement-1 : In (cyclobutadiene) all C-C bond lengths are equal.

Statement-2 : Cyclobutadiene is aromatic and the

Π

orbitals are orthogonal to each other.

The Assertion and Reason are given, you are required to choose any one of the following four responses.

A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C) The Assertion is correct but Reason is incorrect

D) Both Assertion and Reason are incorrect

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

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Assertion :After splitting of d-orbitals during complex formation, the orbitals form two sets of orbitals t2g and eg octahedral field. Reason: Splitting of d-orbitals occurs only in the case of strong field ligands Such as CN−.

Assertion :After splitting of d-orbitals during complex formation, the orbitals form two sets of orbitals $t_{2 g}$ and $e_{g}$ octahedral field. Reason: Splitting of d-orbitals occurs only in the case of strong field ligands Such as $C N^{-}$ .