Which of the following statements is`//` are correct ?
`(I)` White precipitate of `Zn(OH)_(2)` is soluble in excess ammonia and in solutions of ammonium salts.
`(II)` Yellow precipitate of barium chromate is soluble in dilute acetic acid as well as in mineral acids.
`(III)` Green precipitate of `Ni(OH)_(2)` is soluble in excess sodium hydroxide.

Options

A. only `(I)`
B. only `(I)` and `(II)`
C. only `(II)` and `(III)`
D. all

Answer

1

Explanation

`(1)Zn(OH)_(2)darr` is readily soluble in excess ammonia and in solutions of ammonium salts owing to the formation of `[Zn(NH_(3))_(4)]^(2+)`
`(II)BaCrO_(4)` is insoluble in dilute acetic acid.
`(III)Ni(OH)_(2) darr` is insoluble in excess sodium hydroxide.