Classify each of the following as a combination, decomposition, single replacement, double replacement, or combustion reaction:
a. 2Al2o3(s) 4Al(s) + 3O2(g)
b. Br2(g) + BaI2(s) → BaBr2(s) + I2(g)
c. 2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(g)
d. BaCl2(aq) + K2CO3(aq) → BaCO3 (s) + 2KCl (aq)
e. Pb(s) + O2(g) → PbO2(s)
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