Gold is isolated from rocks by reaction with aqueous cyanide, CN:4 Au(s)+8 NaCN(aq)+O 2 (g)+H 2 O(l) longrightarrow 4 Na[Au(CN) 2 ](aq)+4 NaOH(aq) . (a) Which atoms from which compounds are being oxidized, and which at oms from which compounds are being reduced?