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Q.

Silver is extracted from its native ore by

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a

Formation of soluble complex by dilute solution of NaCN in presence of air followed by the reduction with zinc.

b

Formation of soluble complex by dilute solution of NaCN in absence of air followed by the reduction with zinc.

c

Roasting followed by the self reduction.

d

Roasting followed by electrolytic reduction

answer is A.

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Detailed Solution

4Ag+8CN−+2H2O→ 4Ag(CN)2−+4OH− 2Ag(CN)2−+Zn→ Zn(CN)4−2+2Ag↓
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