A substance responds to the following test `:`
`(a)` It gives a green precipitate with ammonia solution which dissolves in excess reagent forming deep blue solution.
`(b)` it gives green precipitate with potassium cyanide solution which dissolves in excess reagent forming a yellow solution.
`(c )` It gives green a reddish`-` brown`//` brown `-` borax bead test in the oxidising flame.
The substance is `:`

Options

A. `Sr^(2+)` salt
B. `Ni^(2+)` salts
C. `Mn^(2+)` salts
D. `Zn^(2+)` salts

Answer

2

Explanation

`(a)Ni^(2+)+2NH_(3)+2H_(2)OrarrNi(OH)_(2) darr ("green")+2NH_(4)^(+)`
`Ni(OH)_(2)darr+6NH_(3)rarr[Ni(NH_(3))_(6)]^(2+)("deep blue")+2OH^(-)`
`(b)Ni^(2+)+2CN^(-)rarrNi(CN)_(2)darr("green")`
`Ni(CN)_(2)+2CN^(-)rarr [Ni(CN)_(4)]^(2-)("yellow")`
`(c )Ni(BO_(2))_(2)-` reddish brown or brown borax bead in oxidising flame.