Calcium oxide( $C a O$ ) can be prepared by:

calcination of calcium carbonate

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heating calcium in presence of oxygen

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thermal decomposition of calcium calcium sulphate

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all of the above

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Solution

The correct option is D all of the above
Calcium oxide can be prepared by calcination of calcium carbonate, heating calcium in presence of oxygen and thermal decomposition of calcium sulphate.
$C a C O_{3} \to C a O + C O_{2}$
$2 C a + O_{2} \to C a O$
$2 C a S O_{4} \to 2 C a O + S O_{2} + 2 O_{2}$

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