1.

Extractionofgoldandsilverinvolves leachingthemetalwithCN^( - )ion.The metal isrecoveredby ....... .

Answer»

displacementof metalbysomeother metalfromthecomplex ion
roastingof metalcomplex
CALCINATION FOLLOWED byroasting
thermaldecompositionof metalcomplex

SOLUTION : `2 [Ag(CN)_2]^(-) + Znto2Ag + [ZN (CN)_4]^( 2-) or2[Au(CN)_(2)^(-)] + Zn to2 Au +[Zn (CN)_4]^( 2- ) `


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