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AP EAMCET202018 Sep 2020Morning ShiftChemistryd and f Block ElementsActual

The yellow colour of chromate ion and orange colour of dichromate ion is due to

Options

  1. A(d )-d transition only
  2. Bcharge transfer only
  3. Cboth (d-d ) transition and charge transfer
  4. D(s-d ) transitions only

Correct answer

B. charge transfer only

Step-by-step solution

In both of chromate ( ( CrO ₄²⁻ ) ) and dichromate ( ( Cr ₂ O ₇²⁻ ) ) ions, ( Cr ) is present in +6 oxidation state, i.e. (d^0 )-configuration. So, (d-d ) transition is absent in both of the ions. Their intense colour (yellow of ( CrO ₄²⁻ ) and orange of ( Cr ₂ O ₇²⁻ )) is the charge transfer (ligand ( ) metal) of oxygen get transfered into vacant (d )-orbital of ( Cr ) (VI).

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