Chemistry
Explain with reasons:
Roasting is carried out on sulphide ores and not on carbonates ores.
Metallurgy
71 Likes
Answer
Roasting is done in presence of air and provides oxygen to metal sulphides, which is required to convert them to metallic oxide and SO2. Whereas, carbonate is changed to oxide by loss of CO2, which occurs in the absence of air and when heated to a high temperature. Hence, roasting is not done on carbonates.
Answered By
49 Likes
Related Questions
(a) Aluminium is a more active metal than iron but suffers less corrosion. Why?
(b) Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis.
Explain with reasons:
In the electrolytic reduction of alumina, the graphite anode is gradually consumed.
or
Why the anode has to be replaced from time to time in this process?
Explain with reasons:
Carbon can reduce lead oxide but not aluminium oxide.
Explain with reasons:
Electrolytic reduction is done to obtain aluminium.