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Q.

The correct statements among I to Ill are 

(I) Valence bond theory cannot explain the colour 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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a

(I), (II) and (III) 

b

(I) and (II) only 

c

(II) and (III) only 

d

(I) and (Ill) only 

answer is C.

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Detailed Solution

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VBT does not explain the colour exhibited by co-ordination compounds.
VBT does not explains and gives quantitative interpretation of magnetic data.
VBT does not distinguish between weak field ligand and strong field ligand. 

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The correct statements among I to Ill are (I) Valence bond theory cannot explain the colour 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.