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  • Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals

Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?

Answers (1)

We will use the following definitions:
1.Calcination: method by which a carbonate ore is converted into oxide
2.Roasting: method by which a sulphide ore is converted into oxide
3.Reduction (to convert metal oxide to metal
Given that ore A gives CO2 on heating, so it must be a carbonate of moderately reactive metal like Zn.
Also given, B gives SO2, so B must be a sulphide ore, e.g., Cu2S, ZnS, HgS, etc.
A will be first subjected to calcination followed by reduction
ZnCO_{3}\rightarrow ZnO+CO_{2}                     (calcination)
To convert it into metal treat it with carbon
ZnO+C\rightarrow Zn+CO                      (reduction)
B will be subjected to roasting followed by reduction
2ZnS+3O_{2}\rightarrow 2ZnO+2SO_{2}       (roasting)
2Cu_{2}S+3O_{2}\rightarrow 2Cu_{2}O+2SO_{2}     (roasting)
2HgS+3O_{2}\rightarrow 2HgO+2SO_{2}       (roasting)
Metal is obtained from these oxides either by using reducing agent like C or by auto reduction
ZnO+C\rightarrow Zn+CO                                (reduction)
Cu_{2}S+2Cu_{2}O\rightarrow 6Cu+SO_{2}          (reduction)

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