Explain the role of the following:(a) NaCN in the separation of ZnS and PbS.(b) SiO2 in the metallurgy of Cu containing Fe as impurity.(c) Iodine in the refining of Ti.

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Explain the role of the following:
(a) NaCN in the separation of ZnS and PbS.
(b) SiO₂ in the metallurgy of Cu containing Fe as impurity.
(c) Iodine in the refining of Ti.

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Detailed Solution

(a) NaCN act as a depressant the separation of ZnS and PbS
(b) SiO₂ act as a flux in the metallurgy of Cu containing Fe as impurity.
(c) Iodine is used to convert Ti into volatile compound (TiI₄) in the refining of Ti.

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