Question

Is $MgO+Cl\to MgCl+O_2$ a reduction reaction?

Answer 1

$\stackrel{+2}{Mg}\stackrel{-2}{O}+\stackrel{0}{Cl}⟶\stackrel{+1}{Mg}\stackrel{-1}{Cl}+\stackrel{0}{O_2}$

Here, $\stackrel{+2}{Mg}$ is reduced to $\stackrel{+1}{Mg}$

$\stackrel{-2}{O}$ is oxidized to $\stackrel{0}{O_2}$

$\stackrel{0}{Cl}$ is reduced to $\stackrel{-1}{Cl}$

Therefore, oxidation & reduction takes place. Therefore, it is a redox reaction & not a reduction reaction.