Which of the following is/are correct for potassium ferrcysnide?

Options

A. it gives a brown precipitate with `Cu^(2+)` ions
B. it gives a red precipitate of mixed salt `Cd^(2+)` ions
C. If in excess gives a white precipitate with `Zn^(2+)`
D. It develops a deep red coloured with `Fe^(3+)`

Answer

a,c