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# A burning strip of Magnesium in introduced into a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is:

$\begin{matrix} (A) C_2O_2\\ (B) N_2 \\ (C) CO_2 \\ (D) H_2O \end{matrix}$

Magnesium reduces Carbon-di-oxide to Carbon, hence the gas in the container is $CO_2$
$2Mg + CO_2 \rightarrow 2MO + C$
edited Mar 16, 2014