Give balanced chemical equations for the reaction of water with:

(a) Sodium

(b) Iron

(c) Carbon dioxide

(d) Sodium oxide

(a) 2Na + 2H₂O ⟶ 2NaOH + H₂ (g)

(b) 3Fe + 4H₂O ⇌ Fe₃O₄ + 4H₂ (g)

(c) CO₂ + H₂O ⟶ H₂CO₃

(d) Na₂O + H₂O ⟶ 2NaOH