H2S+2K--->K2S+H2
H2S+Ba--->BaS+H2
3H2S+2Al--->Al2S3+3H2
2HCl+2K--->2KCl+H2
2HCl+Ba--->BaCl2+H2
6HCl+2Al--->2AlCl3+3H2
2HNO3+2K--->2KNO3+H2
2HNO3+Ba--->Ba(NO3)2+H2
6HNO3+2Al--->2Al(NO3)3+3H2
H2SO4+2K--->K2SO4+H2
H2SO4+Ba--->BaSO4+H2
3H2SO4+2Al--->Al2(SO4)3+3H2
2H3PO4+6K--->2K3PO4+3H2
2H3PO4+3Ba--->Ba3(PO4)2+3H2
2H3PO4+2Al--->2AlPO4+3H2