Complete the missing components/variables given as $x$ in the following reactions:
$C a C O_{3} (s) x \to C a O (s) + C O_{2} (g)$

x = H e a t

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x = C a t a l y s t

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x = O_{2}

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None of these

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Solution

The correct option is A $x = H e a t$
Calcium carbonate on heating decomposes to form calcium oxide(quick lime) and carbon dioxide. The equation for this thermal decomposition reaction can be written as:
$C a C O_{3} h e a t \to C a O + C O_{2}$
Therefore, $x$ in the above reaction is heat.

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