Which of the following is not correctly matched?

Cyanide process : The extraction of gold from its ores by dissolving the gold in a solution of potassium cyanide, KCN.The resulting potassium aurocyanide, KAu(CN)2, with zinc, filtering off, melting down and cupelling the metal.4Au+8KCN+O2+2H2O⟶4KAu(CN)2+4KOH                                         Pot. dicyanoaurate (I)                                        (soluble complex)