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a) Bi(OH)3+HNO3->Bi(NO3)3 + 3H2O
2Ba+O2--->2BaO
BaO+H2O-->Ba(OH)2
Ba(OH)2+H3PO4--->Ba3(PO4)2+H2O
Si+o2-->SiO2
BaO+SiO2-->BaSiO3
BeCl2+K2O-->BeO+2KCl
BeO+H2O--->Be(OH)2