How much percentage of nitrogen present in the atmosphere is unreactive?
73
78
75
76
Glucose + Oxygen → CO2 + H2OWhich process is this ?
Combustion
Photosynthesis
Respiration
Transpiration
Which of the following gases do termites significantly contribute to the atmosphere?
Methane
NO2
CO2
Water vapour
Which of the following oxides are released from industry and which dissolve in rain water to produce 'acidrain'.
Nitrogen and Sulfur
Nitrogen and Silicon
Nitrogen and Phosphorous
Nitrogen and Selenium
Which of the following is used to remove pesticides and some other dissolves substances in modern water treatment process?
Scrubber
Ozone
Filters
Lime
Which of the following is caused by gases in the air, chiefly carbon dioxide and methane?
Photochemical smog
Acid rain
Global warming
Denitrification
With which of the following alkaline substance is acid gases from power stations passed through to make the escaping gases much less harmful?
Sodium hydroxide
Water
Aluminium hydroxide
When animals and plants die and rot away or buried,they slowly form:
Fossil fuels
Limestone
Biomass
Ore
Which type of water is made drinkable by desalination?
River
Well
Lake
Sea
Burning of petrol containing which of the following releases this toxic metal into the environment and can cause serious health hazards?
Chromium
Tin
Lead
Selenium