Home
Class 12
CHEMISTRY
Assertion : According to crystal field t...

Assertion : According to crystal field theory , during complex formation , the d-orbitals split and form two sets of orbitals `t_(2g)` and `e_(g)` .
Reason : Splitting of d-orbitals occurs only in case of strong field ligands .

A

If both Assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

if both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that "According to crystal field theory, during complex formation, the d-orbitals split and form two sets of orbitals \( t_{2g} \) and \( e_g \)." **Explanation**: - In crystal field theory, when transition metal ions form complexes with ligands, the degenerate d-orbitals split into different energy levels due to the electrostatic interactions between the d-electrons and the electric field created by the surrounding ligands. - The splitting results in two sets of orbitals: \( t_{2g} \) (lower energy) and \( e_g \) (higher energy). ### Step 2: Understand the Reason The reason states that "Splitting of d-orbitals occurs only in case of strong field ligands." **Explanation**: - This statement is incorrect. While it is true that strong field ligands cause a larger splitting of d-orbitals (leading to a larger energy gap between \( t_{2g} \) and \( e_g \)), d-orbital splitting can also occur with weak field ligands, although the splitting will be smaller. - The splitting occurs due to inter-electronic repulsion, which is present regardless of whether the ligand is strong or weak. ### Step 3: Conclusion Based on the analysis: - The assertion is **correct** because d-orbitals do split into \( t_{2g} \) and \( e_g \) sets during complex formation. - The reason is **incorrect** because d-orbital splitting occurs with both strong and weak field ligands due to inter-electronic repulsion. ### Final Answer The assertion is correct, but the reason is incorrect. Therefore, the correct option for this question is C. ---
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that "According to crystal field theory, during complex formation, the d-orbitals split and form two sets of orbitals \( t_{2g} \) and \( e_g \)." **Explanation**: - In crystal field theory, when transition metal ions form complexes with ligands, the degenerate d-orbitals split into different energy levels due to the electrostatic interactions between the d-electrons and the electric field created by the surrounding ligands. - The splitting results in two sets of orbitals: \( t_{2g} \) (lower energy) and \( e_g \) (higher energy). ...
Promotional Banner

Topper's Solved these Questions

  • COORDINATION COMPOUNDS

    NCERT FINGERTIPS ENGLISH|Exercise Warners Theory Of Coordination Compound|13 Videos

  • COORDINATION COMPOUNDS

    NCERT FINGERTIPS ENGLISH|Exercise Definition Of Some Important Terms Pertaining To Coordination Compounds|13 Videos

  • COORDINATION COMPOUNDS

    NCERT FINGERTIPS ENGLISH|Exercise NCERT EXEMPLAR PROBLEMS|14 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    NCERT FINGERTIPS ENGLISH|Exercise NCERT Exemplar|15 Videos

  • ELECTROCHEMISTRY

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

According to crystal filed theory , five d-orbitals of an octahedral complex split to give

In an ocahedral crystal field, the t_(2g) orbitals are

On the basis of crystal field theory. Write the electronic confirguration of d^(6) in terms of t_(2g) " and " e_(g) in an octahedral field when D_(0) lt P.

Which of the following complex ions has electrons that are symmetrically filled in both t_(2g) and e_(g) orbitals ?

A: The degeneracy of d-orbitals is lost under strong field ligand R: The degeneracy of d-orbitals does not get lost under weak field ligand

According to the Crystal Field Theory, the energy of d_(xy) orbital is lower than d_(x^(2)-y^(2)) in an octahedral complex because

Which of the following statements is/are correct ? (i) In octahedral complexes , t_(2 g) orbitals possess low energy as compared to e_(g) orbitals . (ii) In tetrahedral complexes , t_(2 ) orbitals possess high energy as compared to e orbitals . (iii) In octahedral complexes , e_(g) orbitals possess low energy as compared to t_(2 g) orbitals .

Give the electronic configuration of the d-orbitals of Ti in [Ti(H_2O)_6]^(3+) ion in an octahedral crystal field.

According to C.F.T, attraction between the central metal ion and ligands in a complex is purely electrostatic. The transition metal which forms the central atom cation in the complex is regarded as a positive ion. It is surrounded by negative ligands or neutral molecules which have a lone apir of electrons, if the ligand is a neutral molecule such as NH_(3) , the negative and of the dipole in the molecule is directed towards the metal cation. the electrons on the central metal ion are under repulsive forces from those on the ligands. thus the electrons occupy the d-orbitals remain away from the direction of approach ligands. ltBrgt Q. The crystal field-spliting order for Cr^(3+) cation is octahedral field for ligands CH_(3)COO^(-),NH_(3),H_(2)O,CN^(-) is:

According to C.F.T, attraction between the central metal ion and ligands in a complex is purely electrostatic. The transition metal which forms the central atom cation in the complex is regarded as a positive ion. It is surrounded by negative ligands or neutral molecules which have a lone apir of electrons, if the ligand is a neutral molecule such as NH_(3) , the negative and of the dipole in the molecule is directed towards the metal cation. the electrons on the central metal ion are under repulsive forces from those on the ligands. thus the electrons occupy the d-orbitals remain away from the direction of approach ligands. Q. The crystal field-spliting order for Cr^(3+) cation is octahedral field for ligands CH_(3)COO^(-),NH_(3),H_(2)O,CN^(-) is: