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JEE Main levelOne or more correct optionsDifficulty 2 of 3mt085

Select the correct statements about calcination.

AThe ore is heated below its melting point in no or limited air.
BA hydrated oxide such as $Al X_{2} O X_{3} \cdot 2 H X_{2} O$ loses water to give the oxide.
C $SO X_{2}$ is the chief gaseous product.
DMoisture and volatile impurities are driven off and a carbonate is converted into its oxide.

Answer: A, B, D

Calcination is done below the melting point with little or no air, and it expels water and

CO X_{2}

(statements 1, 2 and 4 hold).

SO X_{2}

arises from roasting of sulphides, not from calcination.

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