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General Principles And Processes of Isolation Of Elements

Multiple Choice Questions

61.

The chemical reaction that involves roasting process is

Fe₂O₃ + 3CO → 2Fe + 3CO₂
2Al + Fe₂O₃→ 2Fe + Al₂O₃
2ZnS + 3O₂ → 2ZnO + 3SO₂
FeO + SiO₂ → FeSiO₃

62.

Which one of the following oxides is reduced by water gas to obtain the metal during its extraction?

NiO
ZnO
WO₃
Fe₂O₃

63.

Which of the following is not added durig the extraction of silver by cyanide process?

NaCN
Air
Zn
Na₂S₂O₃

64.
What is the role of limestone during the extraction of iron from haematite ore?

Leaching agent

Oxidising agent

Reducing agent

Flux

Flux

During extraction of iron from haematite ore, roasted ore, along with coke and limestone is heated. In blast furnance. Here coke behaves as reducing agent and limestone is worked as flux. In this process, in reducing zone (400-900°C), spongy iron is obtained in slag zone (900-1200°), limestone reacts with impurity (e g , silica) to form slag in the combustion and fusion zone (1200-1600°C), all the charge melts and pig iron is obtained which purified further.