Europeans
Egyptians
Asians
Americans
B. Egyptians
ZnSO4 . 7H2O
FeSO4 . 7H2O
MgSO4 . 7H2O
CaSO4 . 2H2O
nitrogen
nitric oxide
nitrogen peroxide
nitrous oxide
n-heptane
n-octane
iso-heptane
iso-octane
zinc
red phosphorus
magnesium
sulphur
Hard water
Heavy water
Soft water
Both (a) and (b)
urea
ammonium nitrate
ammonium sulphate
calcium cyanamide
manganese
copper
potassium
plumbum
Rutherford
Moseley
Niels Bohr
J.J. Thomson
Fe and C
Mn and C
Fe and Mn
Fe, Mn and C
calcium carbonate
sodium carbonate
magnesium sulphate
ferric chloride
zinc
tin
copper
aluminium
P1V1T1 = P2 V2 T2
P1V1T2 = P2V2T1
P = P1 + P2 + P3
C =
silica, sodium nitrate and soda ash
silica, limestone and sodium nitrate
silica, sodium oxide and limestone
silica, soda ash and limestone
German silver
solder
magnalium
bell metal
Potassium chlorate
Hydrogen peroxide
Copper sulphate
Silver Nitrate
1 and 3
2 and 3
1, 2 and 4
1, 2, 3 and 4
annealing
hardening
quenching
tempering
in the treatment of malaria
to relieve sleepiness
to induce sleep
to lower body temperature
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
Carbon dioxide
Ammonia
Chlorine
Hydrogen sulphide
A
C
B12
B1
carbon dioxide
chloroform
carbon tetrachloride
bleaching powder
acid fumes
sodium bicarbonate
carbon dioxide
sodium carbonate
a very sweet smell
a very pungent smell
an irritating smell
no smell at all
solid carbon dioxide
liquid oxygen
liquid hydrogen
liquid. Chlorine
Potassium nitrate
Silver nitrate
Ammonium carbonate
Ammonium bicarbonate
Protons
Neutrons
Electrons
Protons and electrons
iodine in potassium iodide
iodine in alcohol
iodine in water
iodine in carbon disulphide
potassium
sodium
red phosphorus
white phosphorus
Palladium
NaCI
KOH
Dilute H2SO4