It must be free from suspended impurities
It must be free from harmful bacteria
It must contain traces of sodium bicarbonate
It must have a fishy odour
whooping cough
tetanus
diphtheria
All the three
ethane
ethylene
acetylene
methane
white lead
graphite
red lead
coke
Rutherford
Moseley
Niels Bohr
J.J. Thomson
German silver
solder
magnalium
bell metal
xenon
krypton
argon
helium
methane
nitrogen
carbondioxide
ethylene
adding milk of lime
filtering through sand
adding filter alum
chlorination
acetic acid
chloroform
urea
methane
hydration
dehydration
dialysis
osmosis
electrochemistry
physical chemistry
biochemistry
tinctorial chemistry
nitrogen
nitrous oxide
nitric oxide
nitrogen peroxide
rubbers
fibres
resins
sugars
Gasoline
Kerosene
Sulphuric acid
Alcohol
phenol
TNT
picric acid
iodoform
ZnSO4 . 7H2O
FeSO4 . 7H2O
MgSO4 . 7H2O
CaSO4 . 2H2O
Carbon monoxide
Oxygen
Nitrogen
Hydrogen
Chloroform
Morphine
Streptomycin
Cocaine
galena
dolomite
sylvine
pitchblende
Potassium nitrate
Silver nitrate
Ammonium carbonate
Ammonium bicarbonate
Lead
Tin
Zinc
Aluminium
chlorine
nitrogen
sulphur
hydrogen
carbon disulphide
carbon tetrachloride
phosgene
chloroform
copper sulphate and water
copper sulphate, lime and water
thio-urea and lime
copper sulphate and thio-urea
aldehydes
alkenes
amino acids
alkynes
phenol
washing soda
absolute alcohol
vinegar
it contains carbonates of calcium and magnesium
it contains sodium chloride
it is highly coloured
it contains suspended impurities
Tungsten steel
Manganese steel
Chromium steel
Nickel steel
homogeneous, sulphates
heterogeneous, nitrates
heterogeneous, carbonates
homogeneous, silicates