Bhopal gas tragedy of 1984 took place because methyl isocyanate reacted with
1. DDT
2. Ammonia
3. ${\mathrm{CO}}_2$
4. Water

Identify the correctly matched pair
1. Basel convention - Biodiversity conservation
2. Kyoto protocol - Climate change
3. Montreal protocol - Global warming
4. Ramsar convention - Ground water pollution

Which one of the following is not used for disinfection of drinking water?
1. Chlorine
2. Ozone
3. Chloramine
4. Phenyl

Limit of BOD prescribed by Central Pollution Control Board for discharge of industrial and municipalwaste waters into natural surface waters is
1. < 3.0 ppm
2. < 10 ppm
3. < 30 ppm
4. < 100 ppm

Montreal protocol which calls for appropriate action to protect the ozone layer from human activitieswas passed in year
1. 1985
2. 1986
3. 1987
4. 1988

Blue-baby syndrome results from
1. Excess of ODS
2. Excess of chlorides
3. Excess of dissolved oxygen
4. Methaemoglobin

Photochemical smog does not contain
1. PAN
2. Ozone
3. Nitrogen dioxide
4. ${\mathrm{CO}}_2$

In which one of the following the BOD (Biochemical oxygen demand) of sewage (s), distellary effluent(DE), paper mill effluent (PE) and sugarmill effluent (SE) have been arranged in ascending order.
1. SE < PE < S < DE
2. PE < S < SE < DE
3. S < DE < PE < SE
4. SE < S < PE < DE

In coal fired power plants, electrostatic precipitators are fitted to control emission of:
1. ${\mathrm{NO}}_{\mathrm{x}}$
2. CO
3. SPM
4. ${\mathrm{SO}}_2$

Which is correct
1. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
2. Cyanobacteria, Anabaena and Nostoc are mobilizers of phosphates and plant nutrition in soil
3. At present it is not possible to grow maize without chemical fertilizers
4. excessive use of chemical fertilizers may lead to eutrophication of nearby water bodies