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extraction of gold from its gravel in paragraph

Dec 06, 2019 (i) NaCN in the extraction of gold from gold ore. (it) SiO 2 in the extraction of copper from copper matte. (iii) Iodine in the refining of zirconium. Write chemical equations for the involved reactions. (Delhi 2010) Answer (i) NaCN is used to leach the metal present in the ore by oxidising gold to Au which combines with CN ions to form

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