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3 Ca + 2 H3PO4 = Ca3(PO4)2 + 3 H2
2 K + H2S = K2S + H2
2 Fe + 3 H2CO3 = Fe2(CO3)3 + 3 H2
2 Li + 2 HBr = 2 LiBr + H2
Zn + 2 HNO3 = Zn(NO3)2 + H2