The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was :

What is DDT among the following ?

Which of the following metal is a water pollutant and causes sterility in human being

Which one of the following statements is correct ?

Extensive use of chemical fertilizers may lead toeutrophication of near by water bodies
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil
At present it is not possible to grow maize without chemical fertilizers

Which of the following statements about polar stratosphere clouds (PSCs) is not correct?

PSCs do not react with chlorine nitrate and HCl
Type I clouds are formed at about –77ºC and contain solid HNO₃ . 3H₂O
Type II clouds are formed at about –85ºC and contain some ice
A tight whirlpool of wind called Polar Vortex is formed which surrounds Antarctica

Photo chemical smog formed in congested metropolitan cities mainly consists of

Air pollution causing photo chemical oxidants production include

Exposure of an organism to UV system causes

The false statement among the followings :

The average residence time of NO is one month
Limestone acts as a sink for SO_x
SO_x can be removed from flue gases by passing through a solution of citrate ions
Ammonia acts as a sink for NO_x

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