A.B.C.D.
A.2Na + 2H2O ==2NaOH + H2↑B.CH4 + 2O2==CO2 + 2H2O C.KClO3==2KCl + 3O2↑ D.CaCO3 + 2HCl == CaCl2 + H2O + CO2↑
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