In a combination of `NO_3^(-), Br^(-)` and `I^(-)` present in a mixture, `Br^(-)` and `I^(-)` interfere in the ring test for `NO_3^(-).` These are removed by adding a solution of

Options

A. `AgNO_(3)`
B. `Ag_(2)SO_(4)`
C. `Ag_(2)CO_(3)`
D. None of these

Explanation

`2Br^(-) +Ag_(2)SO_(4) to 2AgBr darr+SO_(4)^(2-)`
`2I^(-) +Ag_(2)SO_(4) to 2AgI darr+SO_(4)^(2-)`
Adding `AgNO_(3)`(A) will introduce `NO_(3)^(-)` ions in the solution.