sodium bicarbonate
sodium carbonate
carbonic acid
sodium hydroxide
C. carbonic acid
neutrons
protons
protons and neutrons
protons and electrons
tincture iodine
paints
ink
aerated water
decomposition of petrol
fermentation of animal and plant waste
destructive distillation of coal
electrolysis of water
nervous disorders
heart diseases
anaemia
impairment of vision
carbon dioxide
chloroform
carbon tetrachloride
bleaching powder
iron with zinc
zinc with iron
copper with silver
silver with gold
diamond
coke
graphite
charcoal
dehydration
oxidation
reduction
dehydrogenation
manganese
vanadium
nickel
chromium
Hard water
Heavy water
Soft water
Both (a) and (b)
terephthalic acid and ethylene glycol
hexamethylene diamine and adipic acid
cellulose nitrate
cellulose acetate
Oxygen
Nitrogen
Hydrogen
Chlorine
a cupel
a long narrow chamber
an open furnace
a closed furnace
Nitrogen
Phosphorus
Potassium
Mercury
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
acetic acid
oxalic acid
chromic acid
citric acid
ferric sulphate
ferric oxalate
ferric nitrate
ferric chloride
homogeneous, sulphates
heterogeneous, nitrates
heterogeneous, carbonates
homogeneous, silicates
50% water
10% water
70% water
20% water
it is lighter than air
in the lower layers it becomes unstable
ultra-violet light is present only in the upper layers
it mixes freely with O2 in the upper layers
urea
methane
acetic acid
benzene
electrochemistry
physical chemistry
biochemistry
tinctorial chemistry
Nitric acid
Hydrochloric acid
Silver nitrate
Sulphuric acid
is unaffected by temperature variations
decreases with increase of temperature
increases with decrease of temperature
increases with increase of temperature
contracts while setting
expands while setting
is highly volatile
does not suffer any changes in volume while setting
Radon
Astatine
Cesium
Ruthenium
Ammonium nitrate
Nitre
Charcoal powder
Sulphur
to make air a moderate supporter of combustion
to maintain the density of air constant
to prevent the hydrogen in air from exploding
to reduce the poisonous nature of ozone in air
Limestone
FeO
SiO2
MgO
nuclear' fusion
radioactive disintegration
nuclear fission
chemical decomposition