A student was given a sample of colourless solution containing three cations and was asked to identify the cations. Student carried out a series of reactions as given below.
Which of the following statements is correct ?

Options

A. Precipitate `'C'` gives Rinmann's green test.
B. Precipitate `'B'` is appreciably soluble in boiling concentrated `H_(2)SO_(4)`
C. Precipitate `(A)` on exposure to sunlight or ultraviolet radiations turns black.
D. All of these

Answer

D

Explanation

(A)`coO.ZnO=`Rinmann's green reagent used as green pigment.
(B)`BaSO_(4)darr +H_(2)SO_(4)("conc.")toBa^(2+)+HSO_(4)^(-)`
(C )`2AgCldarr ("white")overset("hv")to 2Ag darr ("black")+Cl_(2)uarr`