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Mention the difference between calcinati...

Mention the difference between calcination and roasting. How these processes are used in the extraction of zinc? Explain with the help of chemical equations. After these processes, is reduction necessary to obtain zinc ? Why ?

Text Solution

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a. Roasting,St is a process in which sulphide ore is heated in the presence of oxygen to convert it into oxide.
`2ZnS+3O_(2)to2ZnO+2SO_(2)`
Calcination: It is a process in which carbonate ore is heated in the absence of air to form oxide.
`ZnCO_(3)(s)overset("heat")(to)ZnO+CO_(2)`
By reduction process, Zn can be extracted form its ore `ZnO+CtoZn+CO`
b. Aluminium and magnesium
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