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Question

Calcination is used in metallurgy for the removal of?


A

H2O and H2S

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B

CO2 and H2S

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C

H2O and CO2

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D

Water and Sulphide.

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Solution

The correct option is C

H2O and CO2


The explanation for the correct option

  1. Calcination is a process in which ore (Mainly carbonate) is heated at a high temperature in the limited supply of air to remove volatile substances, leaving behind the metal oxide.
  2. For example, when zinc carbonate (ZnCO3) is heated in the absence of oxygen, it gets converted into zinc oxide (ZnO). ZnCO3(s)ZnO(s)+CO2(g)ZincZincoxideCarboncarbonatedioxide

3. The other example that we can take is the heating of rust

Fe2O3.XH2OFe2O3+XH2ORustIron(II)oxideMoisture

4. From the above example, it is clear that CO2 and H2O are volatile substance, which gets removed during calcination.

The explanation for the incorrect option.

Since calcination process is used to remove volatile substances like CO2 and H2O only. Therefore other options are incorrect.

Conclusive statement- option (C) is correct.


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