Give the correct balanced equation for the single replacement reaction of magnesium with aluminum oxide.
a) mg + alo → mgo + al
b) mg + al2o3 → mgo + al
c) 3mg + al2o3 → 3mgo + 2al
d) mg + al2o3 → mgo3 + al2

Answer;

C. 3Mg + Al2O3 → 3MgO + 2Al

Explanation;Single replacement reaction is a type of reaction which one reactant reacts with another and makes a product by replacing one element by another. Mg (Magnesium) reacts with Al₂O₃ (Aluminium oxide) and produces MgO (Magnesium oxide) and Al (Aluminium) as products. Here Al is replaced by Mg. Reaction is 

            Mg + Al₂O₃ → MgO + Al

To balance the reaction equation, both left and right hand sides should have same number of atoms in each element.

The balanced equation will  be;

3Mg + Al2O3 → 3MgO + 2Al