Chemistryeasy · Past Paper
Which of the following is NOT a balanced equation?
A$2H_2 + O_2 \rightarrow 2H_2O$
B$N_2 + 3H_2 \rightarrow 2NH_3$
C$Mg + O_2 \rightarrow MgO$
D$2Na + Cl_2 \rightarrow 2NaCl$
✓ Correct Answer: C — $Mg + O_2 \rightarrow MgO$
In $Mg + O_2 \rightarrow MgO$, there are 2 oxygen atoms on the left but only 1 on the right. It should be $2Mg + O_2 \rightarrow 2MgO$.
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