Two reactions, X and Y, produce carbon dioxide.
$C{H_4}\buildrel X \over
\longrightarrow C{O_2}\buildrel Y \over
\longrightarrow CaC{O_3}$
Which types of reaction are X and Y?
1 )
X: combustion / Y: combustion
X: combustion / Y: thermal decomposition
3 )
X: thermal decomposition / Y: combustion
4 )
X: thermal decomposition / Y: thermal decomposition
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