Chemistry Class-11: Chapter –14. Environmental Chemistry Part – 6

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VI. Long Answer Type

Question: 46

How can you apply green chemistry for the following?

(i) to control photochemical smog.

(ii) to avoid use of halogenated solvents in dry-cleaning and that of chlorine in bleaching.

(iii) to reduce use of synthetic detergents.

(iv) to reduce the consumption of petrol and diesel.


Question: 47

Green plants use carbon dioxide for photosynthesis and return oxygen to the atmosphere, even then carbon dioxide is considered to be responsible for greenhouse effect. Explain why?


Question: 48

Explain how does greenhouse effect cause global warming.


Question: 49

A farmer was using pesticides on his farm. He used the produce of his farm as food for rearing fishes. He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen?


Question: 50

For dry cleaning, in the place of tetrachloroethane, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethane? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution? Explain.