(1) sodium nitrite (16) magnesium oxide
(2) copper (II)oxide (17) potassium sulphate
(3) sodium iodide (18) magnesium nitride
(4) sulfur dioxide (19) sodium nitrate
(5) hydrogen sulfide (20) carbon tetrachloride
(6) magnesium phosphate (21) potassium sulphite
(7) potassium hydrogen carbonate (22) calcium chloride
(8) iron(III) chloride (23) sodium sulphide
(9) sulphur trioxide (24) sodium iodate
(10) iron(II) sulphide (25) iron (III) oxide
(11) magnesium hydroxide (26) magnesium nitrate
(12) sodium bisulphate (27) sodium sulphate
(13) potassium carbonate (28) ammonium hydroxide
(14) carbon monoxide (29) iron(II) sulphate
(15) magnesium hydride (30) carbon dioxide

FeS Mg0 K2S04
CaCl2 NH4OH Mg(N03)2
CO2 NaNO3 Mg3(PO4)2
Na2SO4 NaI03 Mg(OH)2
FeCl3 CO NaHSO4
NaI KHCO3 Fe2O3
Cu0 FeS04 Mg3N2
K2S03 NaNO2 S03
Na2S CCl4 K2CO3
MgH2 SO2 H2S