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2K + H2SO4------>K2SO4 + H2
K2O + H2SO4------>K2SO4 + H2O
2KOH +H2SO4------>K2SO4 + 2H2O
b)
2Na + H2SO4------>Na2SO4 + H2
Na2O + H2SO4------>Na2SO4 + H2O
2NaOH +H2SO4------>Na2SO4 + 2H2O
c)
MgO + SO3---->MgSO4
MgO + H2SO4---->MgSO4 + H2O
Mg(OH)2 + H2SO4------>MgSO4 + 2H2O
d)
CaO + SO3---->CaSO4
CaO + H2SO4---->CaSO4 + H2O
Ca(OH)2 + H2SO4------>CaSO4 + 2H2O
e)
Al2O3 + 3SO3---->Al2(SO4)3
Al2O3 + 3H2SO4---->Al2(SO4)3 + 3H2O
2Al(OH)3+ 3H2SO4------>Al2(SO4)3 + 6H2O