Manganese oxide
Cadmium sulphide
Ferric oxide
Selenium sulphide
Chromium and nickel
Strontiurn and barium
Potassium and mercury
Zinc and sulphur
Mendeleev
Lother Mayer
Dobereiner
Newlands
5% acetic acid in water
10% acetic acid in water
15% acetic acid in water
50% acetic acid in water
Gypsum
Limonite
Bauxite
Haematite
Sodium sulphate
Iron sulphate
Calcium sulphate
Copper sulphate
Quartz and mica
Sand and salt
Sand and silicates
None of these
New metamorphic
Old metamorphic
Old sedimentary
Old igneous
Aluminium
Iron
Lithium
Sodium
Ammonia
Hydrogen sulphide
Chlorine
Hydrogen chloride