When `CO_(2)` is passed into aqueous:

Options

A. `Na_(2)CrO_(4)` solution, its yellow colour change to orange
B. `K_(2)CrO_(4)` solution,it disproportionates to `MnO_(4)` and `MnO_(2)`
C. `Na_(2)Cr_(2)O_(7)` solution its orange colour changes to green
D. `KMnO_(4)` solution, its pink colour chanhe to green

Answer

AB

Explanation

(A) `CO_(2)+H_(2)O to H_(2)CO_(3) to 2H^(+) +CO_(3)^(2-)+2H^(+) to Cr_(2)O_(7)^(2-)+H_(2)O`
(B) `3K_(2)MnO_(4)+2CO_(2) to 2KMnO_(4)+mnO_(2)+2K_(2)CO_(3)`.
(C) No colour change., (D) No colour change.