Home Chemistry D and F - Block Elements General When CO2 is passed into aqueous :
Chemistry D and F - Block Elements General Single Correct MCQ
Published on: August 12, 2026

When CO2 is passed into aqueous :

A
Na2CrO4 solution, its yellow colour changes to orange.
B
K2MnO4 solution, it disproportionates to KMnO4 and MnO2
C
Na2Cr2O7 solution, its orange colour changes to green
D
KMnO4 solution, its pink colour changes to green.

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Text Solution

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The correct answer is:
CHECK THE SOLUTION.

(a, b)

CO2 + H2O H2CO3 2H+ + CO32– ; CrO42– + 2H+ Cr2O72– + H2Oa

3K2MnO4 + 2CO2 2KMnO4 + MnO2 + 2K2CO3.

No colour change.

No colour change.

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