Question

By which method conversion of ZnS and ZnCO3 into ZnO can be carried out ? Explain writing chemical equation .

Page 172 Chapter - 8.Metals

Answer 1

Answer:

ZnS can be converted into ZnO by the method of roasting. In this process the ZnS is heated in the presence of air. Zincblende (ZnS) is converted into Zinc Oxide (ZnO) and SO₂ gas is released. The chemical equation is:

ZnS (s) + 3O₂ → ZnO (s) + SO₂ (g)

When Zinc Carbonate (ZnCO₃) is heated in the presence of air Zinc Oxide (ZnO) is formed. This process is called calcination. The balanced chemical reaction is:

ZnCO₃ (s) → ZnO (s) + CO₂ (g)

Answer 2

Answer:

Extraction of zinc from zinc blende is achieved by:

A. electrolytic reduction.

B. roasting followed by reduction with carbon.

C. roasting followed by reduction with another metal.

D. roasting followed by self reduction.