Question

2 easy example of oxidation

Answer 1

iron oxidised to form rust
Another example of oxidation where an element combines with oxygen is the reaction between magnesium metal and oxygen to form magnesium oxide. Many metals oxidize, so it's useful to recognize the form of the equation:

2 Mg (s) + O2 (g) → 2 MgO (s)

Answer 2

C+O2->CO2
And
2Mg+O2-> 2MgO

I hope it will help you.