2-52. H2, N2, S8, H2O2, CH3COOH
2-53. P2O5, H2SO4, CH3OH, HF, HNO3, Cl2O7, N2H4
2-54. NaNO3, CH3COONa, KOH, Na2O, Na2O2
2-55. KNO3, CH3COOK, Ba(OH)2, BaO, BaO2
MnS + 8HNO₃ → MnSO₄ + 8NO₂ + 4H₂O