Select incorrect statement(s) for `[Cu(CN)_4]^(3–), [Cd(CN)_4]^(2–) and [Cu(NH_3)_4]^(2+)` complex ion.

Options

A. Both `[Cd(CN)_4]^(2–) and [Cu(NH_3)_4]^(2+)` have square planar geometry
B. `[Cu(CN)_4]^(3–) and [Cu(NH_3)_4]^(2+)` have equal no. of unpaired electron
C. `[Cu(CN)_4]^(3–) and [Cd(CN)_4]^(2–)` can be separated from the mixture on passing `H_2S` gas
D. all the three complexes have magnetic moment equal to zero

Answer

A, B, D