Download or Preview Chemistry Class 12 chapter 16 important mcqs solved pdf both Entry Test and Board Exams. These are important chemistry class 12 mcqs from previous papers.
IMPORTANCE OF THESE MCQS
It is tough and difficult task to solve chemistry class 12 mcqs . Students
must have proper preparation of chemistry class 12 mcqs for excellent
marks in chemistry 12. All the important mcqs related to chapter 16 Environmental Chemistry of 2nd
year Chemistry are here for you. These questions are taken from past
papers of 2nd year chemistry of all Punjab Board of Pakistan as ;
Bahawalpur Board
D.G.Khan Board
Faisalabad Board
Gujranwala Board
Lahore Board
Multan Board
Rawalpindi Board
Content is created and designed with intense care and diligence.
These questions (MCQs) are top repetitive in previous papers. Each
question has a detailed answer explanation. In this way you learn from
your mistakes
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can view and download Chemistry class 12 chapter 16 Environmental Chemistry important mcqs. For
other chapters' mcqs click the link at the end of this post. This
content is very helpful for weak students and also helpful for those
students that are better at chemistry 12 exam preparation. These
Questions are based on the current Chemistry Class 12 syllabus according
to Punjab Textbook Board.
About This Chapter
Chapter no. 16 "Environmental Chemistry" of Chemistry class 12 enables the students to learn meaning of environmental pollution. Students learn sources of air pollution like carbon monoxide, carbon dioxide and oxides of nitrogen. Students learn the effects of polluted air on environment and the causes of water pollution. Students learn the preparation of potable water. Students also learn about the solid waste management and its management like dumping and incinerations, treatment of industrial waste and recycling of solid waste. This "Chemistry Class 12 chapter 16 important mcqs solved pdf " covers all important mcqs that are top repetitive
in past papers relevant to above mentioned topics.
👉For Answers of following questions click the show answer button.
1. Ecosystem is smaller unit of
(A) Lithosphere
(B) Hydrosphere
(C) Atmosphere
(D) Biosphere
(D) Biosphere
2. Peroxyacetyl nitrate (PAN) is an irritant to human beings and it affects
(A) Skin
(B) Eyes
(C) Nose
(D) Ear
(B) Eyes
3. A single chloride free radical can destroy how many ozone molecules?
(A) 100
(B) 100,000
(C) 100,00
(D) 10
(B) 100,000
4. The pH of unpolluted rain water:
(A) 5.00
(B) 5.60
(C) 6.50
(D) 7.00
(B) 5.60
5. The main pollutant of leather tanneries in the waste water is:
(A) Chromium III
(B) Chromium IV
(C) Lead
(D) Copper
(B) Chromium IV
6. In purification of portable water the coagulant used is:
(A) Nickle Sulphate
(B) Copper Sulphate
(C) Barium Sulphate
(D) Aluminum Sulphate
(D) Aluminum Sulphate (Alum)
7. Hard water contains:
(A) Salts of Na and K
(B) Salts of Ca and Mg
(C) Sulphates of Al
(D) None of these
(B) Salts of Ca and Mg
8. To avoid the formation of toxic compounds with chlorine, which substance is used for disinfecting water?
(A) KMnO4
(B) O3
(C) Alums
(D) All of above
(B) O3
9. Newspaper can be recycled again and again by how many times?
(A) 2
(B) 3
(C) 4
(D) 5
(D) 5
10. The residence time of NO is:
(A) 1 day
(B) 2 day
(C) 3 day
(D) 4 day
(C) 3 day
11. The smog which has high contents of SO2 is called:
(A) Oxidizing smog
(B) Reducing smog
(C) Neutral smog
(D) None of these
(B) Reducing smog
12. Ozone is present in which layer of atmosphere?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Thermosphere
(B) Stratosphere | 25 - 28 km above the earth surface.
13. Fungicides are the pesticides which kill
(A) Herbs
(B) Insects
(C) Plants
(D) Fungus
(D) Fungus
14. What is the normal amount of overhead of ozone?
(A) 350 DU
(B) 450 DU
(C) 550 DU
(D) 650 DU
(A) 350 DU
15. The yellowish color in photochemical smog is due to the presence of:
(A) Sulphur dioxide
(B) Carbon dioxide
(C) Nitrogen dioxide
(D) Nitric oxide
(C) Nitrogen dioxide
16. Which one is not considered a pollutant?
(A) Sulphur dioxide
(B) Carbon dioxide
(C) Carbon monoxide
(D) Nitrogen dioxide
(B) Carbon dioxide
17. Average residence time of methane in atmosphere is
(A) 1 - 2 years
(B) 2 - 5 years
(C) 3 - 7 years
(D) 1 - 10 years
(C) 3 - 7 years
18. COD is measured by reacting water with:
(A) Chromate ion
(B) Dichromate ion
(C) Sulphate ion
(D) Permanganate ion
(B) Dichromate ion
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