Question: Which of the given reactions are counted as balanced reactions?

Options

A : H2 + O2 ? 2H2O

B : 4Al + 3O2 ? 2Al2O3

C : Mg(OH)2 + 2HNO3 ? 2Mg(NO3)2 + 2H2O

D : N2 + 3H2 ? NH3

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