Arrange the following species in the increasing order of their magnetic moment. (I)VCl3(II)VOSO4(III)Na3VO4(IV)[V(H2O)6]SO4.H2O
A
III<II<I<IV
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B
III<IV<II<I
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C
II<III<I<IV
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D
IV<I<II<III
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Solution
The correct option is AIII<II<I<IV The compound which has the maximum number of unpaired electrons will have higher magnetic moment.
The complexes and the number of unpaired electrons present in them are given below: VCl3;V3+;[Ar]183d2=2 unpaired electrons VO2+;V4+;[Ar]183d1=1 unpaired electron [VO4]3−;V5+;[Ar]183d0= no unpaired electron [V(H2O)6]2+;V2+;[Ar]183d3=3 unpaired electrons Hence, the correct order is III<II<I<IV.