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Question

The yellow colour solution of Na2CrO4 changes to orange red on passing CO2 gas due to the formation of:
  1. CrO3
  2. Cr2O27
  3. Cr2O3
  4. CrO5

A
CrO5
B
Cr2O27
C
Cr2O3
D
CrO3
Solution
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The yellow coloured solution of Na2CrO4 changes to orange red on passing CO2 due to the formation of dichromte ion, Cr2O27.
The reaction is as follows:
CO2+H2OH2CO32H++CO23
2CrO24+2H+Cr2O27(orange red)+H2O

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