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  4. Magnesium wire continues to burn in the atmosphere of CO2,though CO2 is not a supporter of combustion because

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Q. Magnesium wire continues to burn in the atmosphere of $CO_2$,though $CO_2$ is not a supporter of combustion because

The s-Block Elements

Solution:

$Mg$ is more electropositive than carbon and has more affinity for $O_2$ than that of $C$. As such the enthalpy of formation of $MgO$ is more than that of $CO_2$, therefore, Mg continues to bum in $CO_2$
$CO_2 + 2Mg \rightarrow 2MgO + C$