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

Options

A. `Fe^(3+)` gives red precipitate with dimethyl glyoxime in alkaline solution.
B. `Cu^(2+)` ion with potassium iodide solution gives a dirty brownish white precipitate which turns white on adding hypo solution.
C. A filter paper soaked in mercurous nitrate turns black in contact with ammonia gas.
D. `Ag_(2)O` does not dissolve in nitric acid and ammonia solution.

Answer

A,D

Explanation

(A)`Fe^(2+)` responds to this test but no `Fe^(3+),Fe(II)` gives soluble red iron `(II)` dimenthylglyoxime in alkaline solution.
(D)`Ag_(2)Odarr+4NH_(3)+H_(2)Oto2[Ag(NH_(3))_(2)]^(+)+2OH^(-)`
`Ag_(2)O darr +2H^(+) to 2Ag^(+) H_(2)O`
`(B)` and `(C )` are correct statements.