Chocolate brown precipitate is formed with:

Options

A. `Cu^(2+)` ions and `[Fe (CN)_(6)]^(3-)`
B. `Cu^(2+)` ions and `[Fe (CN)_(6)]^(4-)`
C. `Fe^(2+)` ions and `[Fe (CN)_(6)]^(4-)`
D. `Fe^(2+)` ions and dimethylglyoxime

Answer

B

Explanation

(A)`Cu_(3)[Fe(CN)_(6)]_(2)darr`(green) , (B)`Cu_(2)[Fe(CN)_(6)]darr`(chocolate brown)
(C )`Fe_(4)[Fe(CN)_(6)]_(3)darr`(Prussian blue) , (D)red solution of iron `(II)` dimethylglyoxime.