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Q.

VO4,  -3CrO4 and   2-MnO4- are pale yellow, strong yellow and intense purple respectively in aqueous solution. The darkening of colour is due 

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a

The d-d transition

b

Charger transfer

c

Half filled d-subshells

d

Increasing number of unpaired electron

answer is C.

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Detailed Solution

  • VO4,  -3CrO4 and   2-MnO4- are pale yellow, strong yellow and intense purple respectively in aqueous solution. The darkening of colour is due to charge transfer phenomenon 
  • Absence of unpaired electrons in V ,Cr and Mn so no d-d transition 
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