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2. PbO2 ⇒ Pb + O2
3. (NH4)2CO3 ⇒ 2 NH3 + CO2 + H2O
4. Zn (s) + CuSO4 (aq) ⇒ Cu (s) + ZnSO4 (aq)
5. Na (s) + H2O (l) ⇒ NaOH (aq) + H2 (g)
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