IIT-JEE 2007 · Paper 1 · Chemistry Q25

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ChemistrySingle correct+3 / -1Question 25 of 66

Extraction of zinc from zinc blende is achieved by

electrolytic reduction

roasting followed by reduction with carbon

roasting followed by reduction with another metal

roasting followed by self-reduction

Answer and worked solution

Official answer: B

Zinc blende is ZnS. It is roasted to the oxide, which is reduced with coke:
$\ce{2ZnS + 3O2 -> 2ZnO + 2SO2},\qquad \ce{ZnO + C ->[\Delta] Zn + CO}.$

Self-reduction is used for Cu and Pb sulphides, not Zn.

(B)

Topics:Extraction of specific metals

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IIT-JEE 2007 · Paper 1, Chemistry question 25