Which one of the following statements is correct ?

Options

A. Maganese salt give biolet borax bead test in the reducing flame
B. from a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl
C. Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution
D. On boiling a solution having `K^(+),Ca^(2+)` and `HCO_(3)^(-)` ions we get a precipitate of `K_(2)Ca(CO_(3))_2`

Explanation

Ammonia dissolves only AgCl from a mixture of AgCl and AgI