Question

How can we extract we extract Zinc by using following processes?
a) Calcinations
b) Roasting
Coke is used for reduction agent to obtain Zn.Why? Give an example. ​

Answer 1

Answer:

Roasting

Explanation:

(1) Zinc blende is heated in air to get rid of the Sulphur and to convert it into ZnO which is more reactive. This way, it will be easier to obtain the zinc metal.

Reaction when Zinc Blende is heated in the air:

2ZnS+3O

2

→2ZnO+2SO

2

(2) The Zinc Oxide is then mixed with crushed coke (carbon) and heated at 1673 K in fire clay retorts (Belgian Process) when ZnO gets reduced to metallic zinc. In this reaction, carbon acts as the reducing agent as Zinc's oxidation state is reduced from +2 to 0 and carbon itself is reduced.

Reaction when Zinc Oxide is heated in fire clay retorts:

2ZnO+C→2Zn+CO

2

So extraction of zinc from zinc blende is achieved by roasting followed by reduction with carbon

Hence option B is correct.

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