A) Mg
B) Ag
C) Cu
D) Na
Correct Answer: B
Solution :
Silver ore forms a soluble complex with NaCN from which silver is precipitated using scrap zinc. \[4Ag\,+8C{{N}^{-}}+\,2{{H}_{2}}O+{{O}_{2}}\to \underset{So\operatorname{lub}le\,\,complex}{\mathop{4[Ag{{(C{{N}_{2}})}^{-}}}}\,+\,\,4O{{H}^{-}}\]
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