Question

If the burning magnesium ribbon is brought near the mouth of a jar containing carbon dioxide it continuous burning ? why?

Answer 1

Magnesium burns in presence of carbon-dioxide because the oxygen in the carbon-dioxide is able to bond with magnesium and produce an oxide. Carbon is formed as a byproduct, the carbon which is formed in the form of soot. Burning Mg in $C{O}_2$ forms Magnesium oxide.

$2Mg+C{O}_2\to 2MgO+C\left(Soot\right)$

Magnesium is an alkaline earth metal, In its pure form, it burns in air to produce oxides

$2Mg+O_2\to 2MgO$