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2HBr + K20--->2KBr + H2O
2K + 2HBr---->2KBr + H2
HBr + KOH--->KBr + H2O
b) BaS
H2S + BaO---->BaS + H2O
Ba + H2S---->BaS + H2
H2S + Ba(OH)2--->BaS + 2H2O
c) Ca(NO3)2
2HNO3 + CaO---->Ca(NO3)2 + H2O
Ca + 2HNO3---->Ca(NO3)2 + H2
2HNO3 + Ca(OH)2--->Ca(NO3)2 + 2H2O
d) Na2SO4
H2SO4 + Na2O--->Na2SO4 + H2O
2Na + H2SO4--->Na2SO4 + H2
H2SO4 + 2NaOH----->Na2SO4 + 2H2O
e) Li3PO4
2H3PO4 + 3Li2O---->2Li3PO4 + 3H2O
6Li + 2H3PO4---->2Li3PO4 + 3H2
H3PO4 + 3LiOH---->Li3PO4 + 3H2O