MolSynapsequestion bank

MolSynapse / Question bank / Metallurgy / Roasting, calcination and reduction

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mt096

Select the correct statements about the extraction of zinc from zinc blende.

A $ZnO$ is reduced by coke at about 1673 K.
BZinc is obtained as vapour and is condensed.
CThe sulphide is first roasted to $ZnO$ .
DZinc is obtained by self-reduction without any carbon.

Answer: A, B, C

Zinc blende is roasted:

2 ZnS + 3 O X_{2} 2 ZnO + 2 SO X_{2}

. The oxide is reduced by coke near 1673 K,

ZnO + C Zn + CO

, and zinc leaves as vapour above its boiling point and is condensed. Self-reduction without carbon is not used for zinc.

Practice Metallurgy More on Roasting, calcination and reduction

Previous questionNext question

More questions on Roasting, calcination and reduction