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Coordination Compounds question

2019 · 9 Apr · Shift 2 · Q20
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Coordination Compounds question

2019 · 9 Apr · Shift 2 · Q20

JEE MainChemistryCoordination CompoundsMCQ+4 / −1
The correct statements among I to III are : (I) Valence bond theory cannot explain the color exhibited by transition metal complexes. (II) Valence bond theory can predict quantitatively the magnetic properties of transtition metal complexes. (III) Valence bond theory cannot distinguish ligands as weak and strong field ones.
  1. A
    (II) and (III) only
  2. B
    (I) and (II) only
  3. C
    (I), (II) and (III)
  4. D
    (I) and (III) only
View written solutionFree

Correct answer: D

  1. Examine statement (I):

    (I) Valence bond theory cannot explain the color exhibited by transition metal complexes.

    This is true.

    • Valence Bond Theory (VBT) explains bonding in coordination compounds using hybridisation and pairing of electrons.
    • However, it does not explain the origin of color in transition metal complexes.
    • The color is explained by Crystal Field Theory (CFT) or Ligand Field Theory (LFT) through ddd-ddd transitions or charge transfer.

    So, (I) is correct.

  2. Examine statement (II):

    (II) Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.

    This is false.

    • VBT can only give a qualitative idea about magnetism by telling the number of unpaired electrons.
    • It does not give a proper quantitative prediction of magnetic moments in a rigorous way.
    • More importantly, VBT has limitations in explaining magnetic behavior fully.

    So, (II) is incorrect.

  3. Examine statement (III):

    (III) Valence bond theory cannot distinguish ligands as weak and strong field ones.

    This is true.

    • VBT assumes pairing or non-pairing, but it does not explain why some ligands cause pairing and others do not.
    • The distinction between strong field and weak field ligands comes from CFT/LFT, not from VBT.

    So, (III) is correct.

  4. Conclusion:

    Correct statements are (I) and (III) only.

    Hence, the correct option is:

    D\boxed{\text{D}}D​

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