Select the correct statements
When CO2 is passed into aqueous solution of CrO42−, CrO5 is formed
When CO2 is passed into MnO42− (green) solution it turns purple and a brown precipitate of MnO2 is formed.
The yellow colour of CrO42− due to d-d transition
The yellow colour of CrO42 is due to charge transfer.
Correct (1) Cr2O72− is formed (fact).
Function of CO2 to make solution acidic duc to formation of H2CO3.
(4) It is due to charge transfer i.e., momentary transfer of charge from O-atom to metal atom (i.e., Cr) thereby changing O2- ion momentarily to O⊖ ion and reducing the O.S. of Cr from +6 to +5.