When `cO_(2)` is passed into aqueous:A. `Na_(2)CrO_(4)` solution , its yellow colour change to orangeB. `K_(2)MnO_(4)` Solution,it disproportionate to `KMnO_(4)` and `MnO_(2)`C. `Na_(2)Cr_(2)O_(7)` Solution,its orange colour change to greenD. `KmnO_(4)` Solution ,its pink colour change to green.

When `cO_(2)` is passed into aqueous:A. `Na_(2)CrO_(4)` solution , its

1.	When `cO_(2)` is passed into aqueous:A. `Na_(2)CrO_(4)` solution , its yellow colour change to orangeB. `K_(2)MnO_(4)` Solution,it disproportionate to `KMnO_(4)` and `MnO_(2)`C. `Na_(2)Cr_(2)O_(7)` Solution,its orange colour change to greenD. `KmnO_(4)` Solution ,its pink colour change to green.
Answer» `Na_(2)CrO_(4)undersetto(H^(+))Na_(2)Cr_(2)O_(7)("oranged colour")` (B)`MnO_(4)^(2-) undersetto(H^(+))MnO_(4)^(-)` (C )False-in acidic medium no colour change take place. (D)`MnO_(4)^(-)+e^(-)undersetto(Oh^(-))MnO_(4)^(2-)`, in strong alkaline medium pink colour of `KMO_(4)` changes to green. Therefore , (A,B) option are correct

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When `cO_(2)` is passed into aqueous:A. `Na_(2)CrO_(4)` solution , its yellow colour change to orangeB. `K_(2)MnO_(4)` Solution,it disproportionate to `KMnO_(4)` and `MnO_(2)`C. `Na_(2)Cr_(2)O_(7)` Solution,its orange colour change to greenD. `KmnO_(4)` Solution ,its pink colour change to green.

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