Chemistry
Grade-6
Easy
Question
One of the major causes of air pollution is road transportation (emission from vehicles). Vehicles emit various pollutants which are having adverse effects on human beings at even low levels.
(i) Carbon dioxide
(ii) Carbon monoxide
(iii) Nitrogen dioxide
(iv) Benzene
Identify the pollutants which cannot be tolerated by humans at a very low level?
- Only (i) and (ii)
- Only (ii) and (iii)
- Only (ii) and (iv)
- Only (ii)
Hint:
One combines with blood to form carboxyhemoglobin.
This is formed from natural activities like volcanoes or forest fires.
The correct answer is: Only (ii) and (iv)
The pollutants which cannot be tolerated by humans at a very low level are:
Carbon monoxide and Benzene.
Carbon monoxide binds to hemoglobin to form carboxyhemoglobin at any or all of hemoglobin's oxygen-binding sites.
Benzene has a detrimental effect on the bone marrow, causing a decrease in red blood cells and can lead to anemia.
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When rain and snow is mixed together and fall on the ground, they are called as:
When rain and snow is mixed together and fall on the ground, they are called as:
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Indoor air averages 2-5 times more polluted than the outdoor air and air circulation is very less inside as compared to outside. Which of the following pollutants is not considered to cause indoor air pollution?
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iii. Trees are not only natural air filters, but they also cool down summer temperatures by a few degrees.
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Match column A(pollutants) with column B(sources).
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Column B |
| (a) Ammonia |
(i) Fossils fuels |
| (b) Black carbon |
(ii) Fertilizers |
| (c) Formaldehyde |
(iii) Cigarettes |
| (d) Smoke |
(iv) Disinfectants |
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| Column A |
Column B |
| (a) Ammonia |
(i) Fossils fuels |
| (b) Black carbon |
(ii) Fertilizers |
| (c) Formaldehyde |
(iii) Cigarettes |
| (d) Smoke |
(iv) Disinfectants |
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The long form of C.N.G. is:
The long form of C.N.G. is:
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The natural air filters from the following is:
The natural air filters from the following is:
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