A. Bog iron
B. Limestone powder or alkalised alumina
C. Silica gel
D. Active carbon
Related Mcqs:
- Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
A. Active carbon
B. Silica gel
C. Bog iron (iron oxide)
D. Pulverised limestone - Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
A. Packed scrubber
B. Gravity settling chamber
C. Electrostatic precipitator
D. Hydrocyclone - Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?
A. Gravity settling chamber
B. Cyclone separator
C. Electrostatic precipitator
D. Bag filter - Ethanolamine is an absorbent used for the removal of _____________ from air/gas?
A. HF
B. SO2
C. H2S
D. Both B. & C. - 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 - _____________ plant emits large amount of SO2 as an air pollutant?
A. Nitric acid
B. Sulphuric acid
C. Chlor alkali
D. Iron & steel - Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
A. 20
B. 100
C. 400
D. 200 - Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?
A. Moderately
B. Highly
C. Extremely
D. Very extremely - 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 - Exposure to SO2 containing chimney gases results in the__________________?
A. Reduction in strength of leather & cloth
B. Acceleration of corrosion rates of metals
C. Increased drying & hardening time of paints
D. All A., B. and C.
