The study of chemical and biochemical phenomenon that occurs in nature is called environmental chemistry. Earth is composed of numerous minute substances and particles, which are involved in reactions leading to the formation of new ones. Hence, the earth is said to be a closed system and the energy comes and leaves the planet, of which most of the mass stays here. This means that all the elements on this planet are continuously recycling within the environment.
Environmental chemistry is a study that is more than air, water, soil and chemicals. It is the scientific study of the biochemical and chemical phenomena that occur in natural places. This field uses various techniques of biology, maths, genetics, engineering, hydrology, toxicology, etc. The questions given here give you an idea about what type of questions to expect from this topic. This is an easy topic as compared to other chapters for JEE. Students can easily score marks from this chapter. BYJU’S provides accurate solutions created by our subject experts.
Environmental Chemistry JEE Main previous year questions and solutions are given in this article. This article helps students to revise the previous year questions and score higher rank in the JEE exam. Students can easily download these solutions in PDF format for free.
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JEE Main Previous Year Solved Questions on Environmental Chemistry
1. Which is wrong with respect to our responsibility as a human being to protect our environment?
(a) Avoiding the use of floodlighted facilities
(b) Setting up compost tin in gardens
(c) Using plastic bags
(d) Restricting the use of vehicles
Solution:
Using plastic bags should be avoided to protect the environment.
Hence option (c) is the answer.
2. BOD stands for
(a) Biochemical Oxidation Demand
(b) Biological Oxygen Demand
(c) Biochemical Oxygen Demand
(d) Bacterial Oxidation Demand.
Solution:
BOD stands for Biochemical Oxygen Demand.
Hence option (c) is the answer.
3. The layer of atmosphere between 10 km and 50 km above the sea level is called
(a) thermosphere
(b) mesosphere
(c) stratosphere
(d) troposphere.
Solution:
The stratosphere is the layer of atmosphere between 10 km and 50 km above the sea level.
Hence option (c) is the answer.
4. Addition of phosphate fertilizers to water bodies causes
(a) enhanced growth of algae
(b) increase in amount of dissolved oxygen in water
(c) deposition of calcium phosphate
(d) increase in fish population.
Solution:
The addition of phosphate fertilizers to water bodies causes enhanced growth of algae.
Hence option (a) is the answer.
5. Water samples with BOD values of 4 ppm and 18 ppm, respectively, are
(a) clean and highly polluted
(b) highly polluted and highly polluted
(c) highly polluted and clean
(d) clean and clean.
Solution:
Clean water has a BOD value less than 5 ppm. Highly polluted water has BOD value of 17 ppm or more.
Hence option (a) is the answer.
6. Excessive release of CO2 into the atmosphere results in
(a) global warming
(b) formation of smog
(c) polar vortex
(d) depletion of ozone.
Solution:
Excessive release of CO2 into the atmosphere results in global warming.
Hence option (a) is the answer.
7. The higher concentration of which gas in air can cause stiffness of flower buds?
(a) SO2
(b) CO
(c) NO2
(d) CO2
Solution:
The higher concentration of SO2 in the air can cause stiffness of flower buds.
Hence option (a) is the answer.
8. Air pollution that occurs in sunlight is
(a) oxidising smog
(b) fog
(c) reducing smog
(d) acid rain.
Solution:
The main components of the photochemical smog result from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produced by factories and automobiles. Photochemical smog has a high concentration of oxidising agent. So, it is called oxidising agent.
Hence option (a) is the answer.
9. The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was
(a) phosgene
(b) methylisocyanate
(c) methylamine
(d) ammonia.
Solution:
Methylisocyanate was the reason for the Bhopal gas tragedy.
Hence option (b) is the answer.
10.The maximum prescribed concentration of copper in drinking water is
(a) 0.05 ppm
(b) 3 ppm
(c) 5 ppm
(d) 0.5 ppm
Solution:
The maximum prescribed concentration of copper in drinking water is 3 ppm.
Hence option (b) is the answer.
11. Taj Mahal is being slowly disfigured and discoloured. This is primarily due to
(a) acid rain
(b) soil pollution
(c) water pollution
(d) global warming
Solution:
Acid rain is the reason for the discolouration of Taj Mahal.
Hence option (a) is the answer.
12. The upper stratosphere consisting of the ozone layer protects us from the sun’s radiation that falls in the wavelength region of
(a) 400-550 nm
(b) 600-750 nm
(c) 200-315 nm
(d) 0.8-1.5 nm
Solution:
Ozone protects us from the sun’s radiation that falls in the wavelength region of 200-315 nm.
Hence option (c) is the answer.
13. Identify the wrong statement in the following.
(a) Acid rain is mostly because of the oxides of nitrogen and sulphur.
(b) Chlorofluorocarbons are responsible for ozone layer depletion.
(c) Greenhouse effect is responsible for global warming.
(d) Ozone layer does not permit infrared radiation from the sun to reach the earth.
Solution:
Ozoneplanket is the thick layer of ozone which is effective in absorbing harmful ultraviolet rays given out by the sun. It acts as a protective shield. It does not permit the ultraviolet rays from the sun to reach the earth.
Hence option (d) is the answer.
14. Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?
(a) Sulphur dioxide
(b) Carbon dioxide
(c) Nitrogen dioxide
(d) Tetrachloroethylene
Solution:
Liquid carbon dioxide is better to replace conventional halogenated solvents (potentially carcinogenic).
Hence option (b) is the answer.
15. The smog is essentially caused by the presence of
(a) O2 and O3
(b) O2 and N2
(c) oxides of sulphur and nitrogen
(d) O3 and N2.
Solution:
Smog is caused by oxides of sulphur and nitrogen.
Hence option (c) is the answer.
16. Which of the following conditions in drinking water causes methemoglobinemia?
(a) > 50 ppm of chloride
(b) > 50 ppm of nitrate
(c) > 50 ppm of lead
(d) > 100 ppm of sulphate
Solution:
The concentration of nitrate greater than 50 ppm in drinking water causes methemoglobinemia.
Hence option (b) is the answer.
Also Read:- FAQ Environmental Chemistry
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