81. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
82. Inhalation of silica dust causes a disease called
83. White smoke coming out of the chimney of a furnace indicates the use of
84. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
85. Ethanolamine is an absorbant used for the removal of __________ from air/gas.
86. __________ substances present in sewage are removed in grit chamber during sewage treatment.
87. H2S present in gaseous stream can be removed by adsorption on
88. Presence of soluble organics in polluted water causes
89. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
90. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
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