Which of the following statements is incorrect ?

Options

A. In `K_3 [Fe(CN)_6]` , the ligand has satisfied only the secondary valencies of ferric ion
B. In `K_3 [Fe(CN)_6]` , the ligand has satisfied both primary and secondary valencies of ferric ion
C. In `K_4 [Fe(CN)_6]` , the ligand has satisfied both primary and secondary valencies of ferric ion
D. In `[Cu(NH_3)_4]SO_4` , the ligand has satisfied only the secondary valencies of copper

Answer

A

Explanation

Properties of ionic solid