Question
Complete the missing components/ variables given as x and y in the following reaction.

$\text{CaCO}_3\text{(s})\xrightarrow{\text{x}}\text{CaO(s)}+\text{CO}_2\text{(g)}$

Answer

$\text{CaCO}_3\text{(s})\xrightarrow{\text{heat}}\text{CaO(s)}+\text{CO}_2\text{(g)}$

'x' is 'heat'.

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