1.

Statement-1:Extraction of gold from its native ore involves leaching themetal ore with dilute solution of NaCN in presence of air. Statement-2:This is an oxidation reaction and leads to the formation of a soluble complex.

Answer»

Statement-1 is True, Statement-2 is True, Statement-2 is a CORRECT explanation for Statement-1
Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is FALSE.
Statement-1 is False, Statement-2 is True.

Solution :`Au(s)oversetO_2toAu^+(aq.)`
`Au^+ + 2CN^(-) (aq.) to [Au(CN)_2]^(-)` soluble complex.


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