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a) Ca(OH)2 + SO3---->CaSO4 + H2O
b) CaO + SO3---->CaSO4
c) Ca + H2SO4---->CaSO4 + H2
2.
a) 2 KOH + CO2---->K2CO3 + H20
b) K2O + CO2---->K2CO3
c) 2 K + H2CO3---->K2CO3 + H2