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2K + 2HBr -> 2KBr + H2
K2O + 2HBR -> 2KBR + H2O
KOH + HBR -> KBR + H2O
2) BaS
Ba + H2S -> BaS + H2
BaO + H2S -> BaS + H2O
Ba(OH)2 + H2S -> BaS + 2H2O
3) Ca(NO3)2
Ca + 2HNO3 -> Ca(NO3)2 + H2
CaO + 2HNO3 -> Ca(NO3)2 + H2O
Ca(OH)2 + 2HNO3 -> Ca(NO3)2 + 2H2O
4) K2SO4
2K + H2SO4 -> K2SO4 + H2
K2O + H2SO4 -> K2SO4 + H2O
2KOH + H2SO4 -> K2SO4 + 2H2O
5) Li3PO4
3Li + H3PO4 -> Li3PO4 + 3/2H2
3Li2O + 2H3PO4 -> 2Li3PO4 + 3H2O
3LiOH + H3PO4 -> Li3PO4 + 3H2O