Which of the following statement(s) is/are true?

Options

A. Titan yellow solution gives red colouration with a neutral solution containing `Mg^(2+)` ions
B. Solution of nitrile is decomposed by sulphamic acid.
C. `Fe^(2+)` ions give brown colour precipitate with `[Fe(CN)_(6)]^(3-)` ions solution.
D. Green precipitate of `Cr(OH)_(3)` is soluble in `Na_(2)O_(2)`

Answer

B,D

Explanation

(A)Red colour solution or precipitate is produced when reagent reacts in alkaline solution.
(B)`HO.SO_(2).NH_(2)+HNO_(2)toN_(2)+2H^(+)SO_(4)^(2-)+H_(2)O`
( C)`Fe^(2+)+[Fe(CN)_(6)]^(3-)toFe^(3+)+[Fe(CN)_(6)]^(4-)`
`4Fe^(3+)+[Fe(CN)_(6)]^(4-)toFe_(4)+[Fe(CN)_(6)]^(3)darr`(Turnbull's blue)
(D)`4Cr(OH)_(3)darr +5O_(2)^(2-)to4CrO_(4)^(2-)`(yellow solution)`+6H_(2)O`