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?

Related Mcqs:

The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?

A. Catalytic conversion B. Green house effect C. Global warming D. Both B. and C....

Which of the following pollutants, if present in atmosphere is detectable by its odour ?

A. CO B. SO2 C. NO2 D. CO2...

Soluble silica present in boiler feed water can be removed by______________________?

A. Coagulation B. Filtration C. Anion exchanger D. Preheating it...

Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

A. Sedimentation tank B. Circular clarifier C. Mechanical flocculation D. Chemical coagulation...

Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?

A. Hydrocarbons B. Hydrogen fluoride C. Hydrogen sulphides D. Nitrogen dioxide...