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Question

From which of the following ores, metals cannot be extracted using calcination process?


A

CaCO3

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B

Al2O3.2H2O

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C

CaCO3.Ca(OH)2

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D

ZnS

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Solution

The correct option is D

ZnS


Calcination is the process of converting an ore into an oxide by heating it strongly. The ore is heated below its melting point in absence of oxygen and is commonly used for converting carbonates and hydroxides to their respective oxides. This process is applicable to CaCO3.Ca(OH)2 ,Al2O3.2H2O and CaCO3.

Roasting is a method which is used for converting sulphide ores to oxides. ZnSis roasted to get oxide.
2ZnS(s)+ 3O2(g)→2ZnO(s) + 2SO2(g)


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