Miners obtain gold by soaking gold-containing ores in an aqueous solution of sodium cyanide. A very soluble complex ion of gold forms in the aqueous solution because of the redox reaction
4 Au ( s ) + 8 NaCN ( aq ) + 2 H2O( l ) + O2 ( g ) → 4 Na[Au(CN)2]( aq ) + 4 NaOH ( aq )
Gold miners then react the basic aqueous product solution from part C with Zn dust to get gold metal. Write a balanced redox reaction for this process.