The pair of compounds which can exist together in aqueous solution is

Options

A. `Na_(2)CO_(3)` and `NaHCO_(3)`
B. `K_(2)Cr_(2)O_(7)` and `NaOH`
C. `NaHCO_(3)` and `NaOH`
D. none of these

Answer

A

Explanation

`HCO_(3)^(-)` in presence of `OH^(-)` is converted to `CO_(4)^(2-),Cr_(2)O_(7)^(2-)` in presence of `OH^(-)` is converted to `CrO_(4)^(2-)`.