The correct statement 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

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(I) and (III) only

(II) and (III) only

(I), (II) and (III)

(I) and (II) only

answer is A.

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Detailed Solution

The colour that co-ordination compounds display is not explained by VBT.

VBT provides a quantitative interpretation of the magnetic data but does not explain it.

Strong field ligands and weak field ligands are not distinguished by VBT.

Hence, the correct option is (A)

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