Which one of the following statement is correct?

Options

A. From a mixed precipitate of `AgCI` and `AgI`, ammonia solution dissolves only `AgCI`.
B. Ferric ions gave a deep green precipitate on adding potassium ferrocyanide solution.
C. On boiling a solution having `K^(+),Ca^(2+)` and `HCO_(3)^(-)` ions we get a precipitate of `K_(2)Ca(CO_(3))_(2)`.
D. Manganse salts give a violet borax bead test in the reducing flame

Answer

A

Explanation

(a) `AgI` is insoluble in conc. `NH_(3)`
(b) `Fe^(3+) +K_(4)[Fe(CN)_(6)] rarr underset(("Prussian blue"))(Fe_(4)[Fe(CN)_(6)]_(3))`
(c) `Ca^(2+) +HCO_(3)^(-)overset(Delta)rarr CaCO_(3)darr`.
(d) Manganese salts give colourless borax bead test in reducing flame.