MCQ
Write the balanced equation for the reaction for the following statement : $\ce{Mg}$ burns in presence of air.
  • A
    $\mathrm{Mg}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{MgO}_2(\mathrm{~s})$
  • B
    $2 \mathrm{Mg}(\mathrm{s})+2 \mathrm{O}(\mathrm{g}) \rightarrow 2 \mathrm{MgO}(\mathrm{s})$
  • $2 \mathrm{Mg}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{MgO}(\mathrm{s})$
  • D
    $\mathrm{Mg}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{MgO}(\mathrm{s})$

Answer

Correct option: C.
$2 \mathrm{Mg}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{MgO}(\mathrm{s})$
When $\ce{Mg}$ burns with oxygen gas, it undergoes the process of oxidation, and magnesium oxide is formed.
Balanced equation is : $2 \mathrm{Mg}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{MgO}(\mathrm{s})$

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