A. Calcium
B. Fluorine
C. Phosphorous
D. Sulphur
Related Mcqs:
- Which of the following pollutants is absent in the emissions from a fertiliser plant ?
A. SO2 & SO3
B. NO2
C. NH3
D. CO - 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 - _____________ plant emits large amount of SO2 as an air pollutant?
A. Nitric acid
B. Sulphuric acid
C. Chlor alkali
D. Iron & steel - Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________?
A. Quenching of hot coke
B. Discharging in the river stream
C. Filtration and recycling for cooling coke oven gas
D. None of these - Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?
A. Chlorination
B. Treating in biological oxygen pond
C. Chemical coagulation
D. None of these - Tri-sodium phosphate is used in boiler water treatment to reduce____________________?
A. Turbidity
B. Caustic embrittlement
C. Suspended silica
D. Dissolved oxygen - For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?
A. 10000
B. 5
C. 500
D. 1000 - Salt content in sea water is about ______________ percent?
A. 0.5
B. 1
C. 3.5
D. 9.05 - There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?
A. Mercury
B. Arsenic
C. Aluminium
D. Lead - The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________?
A. Mercury
B. Brine
C. Phosphate
D. None of these
