Q1 of 23 Page 198

Name the following pollutants :

(i) A pollutant which is mainly responsible for causing acid rain


(ii) Any two chemicals leading to the formation of ozone holes.


(iii) The chemical element which caused Minamata disease in Japan.

(i) Sulphur dioxide


Explanation: When Sulphur dioxide comes in contact with moisture in the atmosphere, it leads to the formation of sulphuric acid. This is extremely corrosive in nature.


(ii) The two chemicals that lead to the formation of ozone holes are:


1. Bromochlorodifluoromethane


2. Chlorofluoromethane


Explanation: These chemicals, on reaching the stratosphere, release free halogen radicals. The atoms initiate the process of breakdown of ozone into oxygen.


(iii) Mercury caused the Minamata disease that occurs due to the mercury poisoning. It leads to neurological disorders.


More from this chapter

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2

Which one of the following is a “dirty” practice contributing to pollution and seriously needs stoppage by educating the public?

 3

One of the examples of radiation pollutants is

 2

Match the items in column I with the closely related ones in column II.































Column I



Column II



(i) Chlorofluocarbons (CFCs)



(a) Global warming



(ii) Flysh



(b) Biodegradable



(iii) Cow dung



(c) Nuclear radiation pollutant



(iv) CO2 and methane



(d) Acid rain



(v) Sulphur dioxide



(e) Industrial waste



(vi) Iodine – 131



(f) Ozone depletion


 3

Fill in the blanks:

(i) Rubber particles and dust raised by running motor vehicles are examples of .................... pollutants.


(ii) Too frequent exposure to.................... in a medical diagnostic technique may damage chromosomes.


(iii) Thermal power plants give out a lot of .................... waste water.


(iv) Sewage is a liquid waste from………