A. Nitric acid
B. Sulphuric acid
C. Chlor alkali
D. Iron & steel
Related Mcqs:
- ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?
A. Industrial chimney exhaust
B. Automobiles exhaust
C. Photochemical reaction in polluted atmosphere
D. Burning of domestic fuel - Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
A. Thermal power plant
B. Petroleum refinery
C. Nitric acid plant
D. Sulphuric acid plant - When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?
A. 0.01
B. 0.1
C. 1
D. 4 - Which of the following is an adsorbent used for the removal of SO2 from gas/air ?
A. Bog iron
B. Limestone powder or alkalised alumina
C. Silica gel
D. Active carbon - Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
A. 20
B. 100
C. 400
D. 200 - ______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
A. Calcium
B. Fluorine
C. Phosphorous
D. Sulphur - Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
A. NOx
B. Hg
C. SO2
D. F - Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?
A. I-131
B. Sr-90
C. Au-198
D. Ra-226 - Which of the following is the most severe air pollutant ?
A. Hydrocarbons
B. NOx
C. SO2
D. CO - Which of the following is not a secondary air pollutant ?
A. Ozone
B. Photochemical smog
C. Sulphur dioxide
D. All A., B. & C.
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