Which of the following is correct?

Options

A. `AgCI(s)+Na_(3)AsO_(3)rarr` Colourless solution
B. `FeCI_(3)(aq)+K_(4)Fe(CN)_(6)rarr` Brown precipitate
C. `FeCI_(3)(aq)+K_(3)Fe(CN)_(6)rarr` Brown colouration
D. `CuSO_(4)(aq)+KCN` (excess)`rarr` Blue colouration

Answer

C

Explanation

(a) Yellow ppt.., `Ag_(3)AsO_(3)`
(b) Prussian blue ppt,. `Fe_(4)[Fe(CN)_(6)]_(3)`
(c) Brown colouration, `Fe[Fe(CN)_(6)]`
(d) Colourless, `[Cu(CN)_(4)]^(3-)`