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Q 2676478376.     Describe the role of
(i) NaCN in the extraction of gold from gold ore.
(ii) `SiO_2` in the extraction of copper from copper matte.
(iii) Iodine in the refining of zirconium.
Write chemical equations for the involved reactions.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)