Which one of the following is not an example of calcination?

Which one of the following is not an example of calcination

Answer: Option 2
Solution:
Calcination is the process in which the concentrated ore is strongly heated in the absence of air. During this process, the water of crystallisation present in the hydrated oxide escapes as moisture. Any organic matter (if present) also get expelled leaving behind a porous ore. This method can also be carried out with a limited supply of air.
Since Option 1, 3 does not involve either air/oxygen on heating and Option 4 is dehydration, Option 2 is correct.

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