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Write chemical reactions taking place in the extraction of zinc from zinc blende.

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Roasting. The concentrated ore is then roasted in présence of excess of air at about 1200K when zinc oxide (ZnO) is formed.
`underset("Zinc blende")(2ZnS)+3O_(2) overset(Delta) to underset("Zinc oxide")(2ZnO)+2SO_(2)`
(b) Reduction. Zinc oxide obtained above is mixed with powdered coke and heated to 1673-K in a fire clay retort when it is reduced to zinc metal.
`ZnO+C overset(1673K) to Zn+CO`
At 1673 K, zinc metal being volatile (b.p. 1180 K), distils over and is condensed.
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