Question

What are the methods adopted to reduce the ores to their representatives metal oxide write differences between the methods?​

Answer 1

Explanation:

Methods to make ores to metal oxide :

1. Roasting : the sulphide ores are converted into oxides by heating in the presence of excess air.
2. Calcination : the carbonate ores are changed into oxides by heating strongly in limited air.

Difference between roasting and calcination :

1. Roasting is used to separate sulphide ores whereas calcination is used to separate carbonate ores.
2. Roasting Is done in excess air whereas calcination is done in limited air.

Example :

2ZnS + 3O2 - - - > 2ZnO + 2SO2 ( roasting)

ZnCO3 - - - - > ZnO + CO2 ( calcination)

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