K+p= Ba+kcl= Ag+h3po4= Sr+h2o= Li+O2= Zn+h2s
3K + P = K₃P Ba + KCl ≠ Ag + H₃PO₄≠ Sr + 2H₂O = Sr(OH)₂ + H₂ 4Li + O₂ = 2Li₂O Zn + H₂S = ZnS + H₂