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Environmental Engineering in CE

Environmental Engineering in CE
The widest explosive limit is of __________ , thereby making it the most explosive gas.

Petrol vapor
Hydrogen
Acetylene
Carbon monoxide

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Environmental Engineering in CE
Which of the following is the most widely used disinfectant in water treatment?

Cation exchanger
Chlorine
Irradiation of water by ultraviolet light
Coagulation

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Environmental Engineering in CE
Main pollutants released from iron & steel industry is

SO₃, NO₂ & CO₂
CO₂, H₂S & NO₂
CO, CO₂ & SO₂
H₂S, NO & SO₃

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Environmental Engineering in CE
Inorganic impurities causing water pollution is

Protein
Fats
Carbohydrates
Salts of metals

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

10-100
100-200
100-1000

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Environmental Engineering in CE
TLV of mercury in potable (drinking) water is about __________ ppm.

5
0.1
1
0.001

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