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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
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 transition metal complexes

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

  • A
    $I$ and $II$ only
  • B
    $I$, $II$ and $III$
  • ✓
    $I$ and $III$ only
  • D
    $II$ and $III$ only
✓

Answer

Correct option: C.
$I$ and $III$ only
c
$(i)$ $VBT$ does not explain colour exhibited by complex of transition metal because splitting of $d-$ orbitals in explained by $CFT$.
$(ii)$ $VBT$ does not distinguish between strong and weak field complex.
$(iii)$ $VBT$ does not give quantitative interpretation of magnetic properties.
$\therefore $  According to question statement $I$ and $III$ are correct

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