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JEE Main levelSingle correct optionDifficulty 2 of 3mt084

Which operation is a calcination whose chief gaseous product is $CO X_{2}$ ?

Aheating $ZnCO X_{3}$ strongly in a limited supply of air
Bheating $ZnS$ in excess air
Cheating $HgS$ in air
Dheating $Al X_{2} O X_{3} \cdot 2 H X_{2} O$ strongly

Answer: A

Calcination applies to carbonates and hydrated oxides heated with little or no air.

ZnCO X_{3} ZnO + CO X_{2}

gives

CO X_{2}

. Heating the hydrated oxide gives steam, and heating sulphides in air is roasting giving

SO X_{2}

.

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