Environmental Chemistry(12th Grade > Chemistry ) Questions and Answers
Explanation:-
Answer: Option C. -> A is correct but R are not correct.:
C
CFC’s are responsible for depletion of ozone layer. Hence it is hazardous to environment. But they are non-reactive, non-flammable and non-toxic gases. That’s why they are used in refrigerators.
Explanation:-
Answer: Option C. -> increase pollution by particulate matter:
C
Reforestation will decrease the pollution by particulate matter because it helps in deposition of suspended particulates on the leaves which are subsequently washed down by rain waters.
Explanation:-
Answer: Option D. -> Would result in lowering the level of oceans due to high evaporation:
D
Greenhouse effect would cause melting of polar ice caps and glaciers that will result in increasing the ocean levels, thereby causing submergence of low lying areas.
Explanation:-
Answer: Option C. -> Very much polluted with organic chemicals which are decomposed by micro-organisms:
C
BOD is the amount of oxygen required by bacteria to break down the organic matter present in certain volume of water. High BOD means high demand for oxygen, which means high levels of organic pollutants.