An original solution of an inorganic salt in dilute `HCl` gives a brown colouration with potassium hexacyanidoferrate `(III)` and reddish brown colouration with sodium acetate solution. The cation of the salt is `:`

Options

A. `Ni^(2+)`
B. `Fe^(3+)`
C. `Cu^(2+)`
D. none

Answer

2

Explanation

`Fe^(3+)+[Fe(CN)_(6)]^(3-)rarrFe[Fe(CN)_(5)]"brown colouration"`
`2Fe^(3+)+6CH_(3)COO^(-)+2H_(2)OhArr[Fe_(3)(OH)_(2)(CH_(3)COO)_(6)]^(+)+2H^(+)`