2%
2.5%
3%
3.5%
Burning of paper
Rusting of iron
Burning of coal
Evaporation of water
Semiconductors
Transistors
Solar energy devices
All of these
BHT
Sodium metabisulphite
Saccharin
Sodium sulphate
Acetic acid
Hydrochloric acid
Nitric acid
Sulphuric acid
Thermosphere
Troposphere
Mesosphere
Stratosphere
Sodium silicate
Free fatty acid
Sodium chloride
Potassium carbonate
Copper, nickel and zinc
Aluminium, copper and traces of Mg and Mn
Copper and tin
Copper and zinc
Cobalt-60
Phosphorous-32
Iron-59
Iodine-123
C2
C50
C60
C120