Short Answer TypeA large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest reason for the fish kill.
What would have happened if the greenhouse gases were totally missing in the earth's atmosphere ? Discuss.
What do you mean by green chemistry? How will it help decrease environmental pollution?
Or
Comment: 'Green chemistry is an alternative tool for reducing pollution'
By green chemistry, we mean producing the chemicals of our daily needs using such reactions and chemicals processes which neither use toxic chemicals nor emit such chemicals into the atmosphere.
Green chemistry uses mild and environmental friendly reagents such as sunlight, microwaves, sound waves and enzymes. These are not toxic reagents. Recently many photochemical reactions are carried out using sunlight and ultraviolet light. Many known reactions have also been carried out by using microwave arrangement. Instead of microwaves, sound waves have also been used to carry out certain known chemical reactions. It is evident that if continuous efforts are made to develop green chemistry, it will certainly help us to keep our environment pollution free.
Long Answer TypeHave you ever observed any water pollution in your area? What measures would you suggest to control it?
Short Answer TypeLong Answer TypeDo you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
Multiple Choice QuestionsOzone is present as a chief constituent in which region of the atmosphere?
Troposphere
Stratosphere
Mesosphere
Thermosphere
The gas leaked from a storage tank of the Union Carbide plant in Bhopal tragedy was
Methyl isocyanate
Methylamine
Ammonia
Ammonia
A water sample has ppm level concentration of following anions
F-= 10; SO42- =100; NO3-= 50
the anion/anions that make/makes the water sample unsuitable for drinking is /are:
only NO3-
both 2 SO4- and NO3-
only F–
only F–
Identify the wrong statements in the following:
Chlorofluorocarbons are responsible for ozone layer depletion
Greenhouse effect is responsible for global warming
Ozone layer does not permit infrared radiation from the sun to reach the earth
Ozone layer does not permit infrared radiation from the sun to reach the earth
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