Describe how the following changes takes place?
1. Pig iron into steel.
2. Zinc oxide into metallic zinc.
3. Alumina into aluminium.
Answers
Answer:
this is your answer ...............
Explanation:
Email Chat with tutor Login DONATE
logo Ask Questions, Get Answers
Questions >> CBSE XII >> Chemistry >> Isolation of Elements
Next similar questionQ)
Describe how the following changes are brought about : (i) Pig irons into steel (ii) Zinc oxide into metallic zinc
Homework help Revision notes Donate
A)
Solution :
(i) Pig iron is converted into steel by heating in a convertor .
A blast of oxygen diluted with carbon dioxide is blown through the converter .
Oxygen reacts with impurities and raised the temperatures to 2173k .
Carbon gets oxidized to CO which burns off at the mouth of the converter .
Oxides of silicon and Mg form slag, when the flame is stopped, slag is tapped off and other metals like Mn,Cr,Ni,W may be added in the end .
(ii) The reduction of zinc oxide is done using coke as a reducing agent.
For the purpose of heating , the oxide is made into briskets with coke and clay
ZnO+C→Zn+CO
The metal is distilled off and collected by rapid chilling