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a. N₂ + 3H₂ = 2NH₃
b. it is already balanced
c. 2Mg + O₂ = 2MgO
d. 4Al + 3O₂ = 2Al₂O₃
e. 4Fe + 3O₂ = 2Fe₂O₃
f. Zn + 2HCl = ZnCl₂ + H₂
g. 2H₂ + O₂ = 2H₂O
h. it is already balanced
i. 2Na + 2H₂O = 2NaOH + H₂
j. 2Na + 2HCl = 2NaCl + H₂
valency of oxygen is 2
valency of aluminium is 3
valency of magnesium is 2
valency of carbon is 4
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