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NEET • CHEMISTRY • ENVIRONMENTAL CHEMISTRY

Environmental chemistry practice · Mixed difficulty

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Showing 1-30 of 39 questions
1 Hard
1 of 39
Application +4 | -1
Average ozone concentration in Jakarta, Indonesia have been reported to be 0.015 mg m−30.015 \mathrm{~mg} \mathrm{~m}^{-3} and those in Tokyo, Japan are 20 ppmV20 \mathrm{~ppmV}. What is the approximate ratio of these two values, when expressed in the same unit?
View answer and explanation
Correct option: B
1:31: 3
Option B (1: 3) is correct because after converting both concentrations to the same units, the ratio is approximately 1:3.
2 Easy
2 of 39
Understanding +4 | -1
Increasing skin cancer and high mutation rate are due to
View answer and explanation
Correct option: B
Ozone depletion
Option B (Ozone depletion) is correct because ozone depletion leads to increased UV radiation reaching the Earth's surface, causing skin cancer and mutations.
3 Hard
3 of 39
Understanding +4 | -1
S-I: Aldehydes are one of the constituents of photochemical smog.
S-II: Aldehydes are produced by photochemical oxidation of hydrocarbons by ozone.
View answer and explanation
Correct option: A
Both S-I &\& S-II are correct
Option A (Both S-I & S-II are correct) is correct because aldehydes are indeed constituents of photochemical smog and are produced by the photochemical oxidation of hydrocarbons by ozone.
4 Hard
4 of 39
Remembering +4 | -1
Which of the following statements is false?
View answer and explanation
Correct option: A
London smog is oxidising in nature
Option A (London smog is oxidising in nature) is correct because London smog is reducing in nature, not oxidizing.
5 Hard
5 of 39
Understanding +4 | -1
Most suitable atmospheric reaction which is relating to that of disfiguring of Taj Mahal is:
View answer and explanation
Correct option: D
CaCO3+H2SO4→CaSO4+H2O+CO2CaC{O_3} + {H_2}S{O_4} \to CaS{O_4} + {H_2}O + C{O_2}
Option D (CaCO3+H2SO4→CaSO4+H2O+CO2CaC{O_3} + {H_2}S{O_4} \to CaS{O_4} + {H_2}O + C{O_2}) is correct because it represents the reaction of sulfuric acid with calcium carbonate (marble), which is the primary cause of the disfigurement of the Taj Mahal.
6 Hard
6 of 39
Remembering +4 | -1
Formation of London smog takes place in
View answer and explanation
Correct option: D
Winter during morning time
Option D (Winter during morning time) is correct because London smog, also known as classical smog, typically forms in winter mornings due to temperature inversions and high levels of sulfur dioxide and particulate matter.
7 Medium
7 of 39
Remembering +4 | -1
Maximum limit of nitrate in drinking water is ____ ppm and its excess concentration causes ____
View answer and explanation
Correct option: B
50 ppm, blue baby syndrome
Option B (50 ppm, blue baby syndrome) is correct because the maximum limit of nitrate in drinking water is 50 ppm, and excess concentration can cause methemoglobinemia, also known as blue baby syndrome.
8 Medium
8 of 39
Remembering +4 | -1
Ozone layer of stratosphere requires protection from indiscriminate use of
View answer and explanation
Correct option: C
Aerosols and high flying jets
Option C (Aerosols and high flying jets) is correct because aerosols (like CFCs) and emissions from high-flying jets contribute to the depletion of the ozone layer.
9 Medium
9 of 39
Understanding +4 | -1
Pick up the correct statement
View answer and explanation
Correct option: D
Los Angeles smog forms in day time whereas London smog forms in early morning hours
Option D (Los Angeles smog forms in day time whereas London smog forms in early morning hours) is correct because Los Angeles smog (photochemical smog) forms in the presence of sunlight, while London smog (classical smog) forms in cool, damp conditions, typically in the early morning.
10 Easy
10 of 39
Remembering +4 | -1
Which of the following is not an air pollutant?
View answer and explanation
Correct option: A
N2{\mathrm{N}_2}
Option A (N2{\mathrm{N}_2}) is correct because nitrogen gas is a natural component of air and is not considered a pollutant in its normal concentration.
11 Easy
11 of 39
Understanding +4 | -1
Which of the following conditions shows the non polluted environment?
View answer and explanation
Correct option: A
pH of rain water is 5.6
Option A (pH of rain water is 5.6) is correct because a pH of 5.6 for rainwater indicates a natural, unpolluted environment due to dissolved carbon dioxide.
12 Medium
12 of 39
Understanding +4 | -1
Which one is the most toxic?
View answer and explanation
Correct option: B
CO
Option B (CO) is correct because carbon monoxide is highly toxic due to its ability to bind strongly to hemoglobin, preventing oxygen transport.
13 Easy
13 of 39
Understanding +4 | -1
The incorrect statement among the following is
View answer and explanation
Correct option: A
Classical smog occurs in warm, dry and sunny climate
Option A (Classical smog occurs in warm, dry and sunny climate) is correct because classical smog (London smog) occurs in cool, humid conditions, not warm, dry, and sunny climates. Photochemical smog occurs in warm, dry and sunny climate.
14 Easy
14 of 39
Analyzing +4 | -1
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Hydrogen is an environment friendly fuel.
Reason R: Atomic number of hydrogen is 1 and it is very light element.
In the light of the above statements, choose the correct answer from the options given below
View answer and explanation
Correct option: C
Both A and R are true but R is NOT the correct explanation of A
Option C (Both A and R are true but R is NOT the correct explanation of A) is correct because hydrogen is an environment-friendly fuel, and it has an atomic number of 1, but the latter doesn't explain the former.
15 Easy
15 of 39
Remembering +4 | -1
Which of the following is a living component of atmosphere?
View answer and explanation
Correct option: B
Biosphere
Option B (Biosphere) is correct because the biosphere encompasses all living organisms on Earth and their interactions.

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16 Easy
16 of 39
Understanding +4 | -1
Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due to
View answer and explanation
Correct option: D
Forming stable compound with haemoglobin
Option D (Forming stable compound with haemoglobin) is correct because carbon monoxide binds strongly to haemoglobin, preventing oxygen transport.
17 Easy
17 of 39
Understanding +4 | -1
Which of the following statements is false?
View answer and explanation
Correct option: D
Oil slick in a sea water increases DO value
Option D (Oil slick in a sea water increases DO value) is correct because oil slicks decrease, not increase, the dissolved oxygen (DO) value in seawater.
18 Hard
18 of 39
Remembering +4 | -1
The greatest affinity for haemoglobin is shown by
View answer and explanation
Correct option: A
NONO
Option B (COCO) is correct because carbon monoxide has a much higher affinity for hemoglobin than oxygen, nitrogen oxide, or carbon dioxide.
19 Easy
19 of 39
Analyzing +4 | -1
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Polluted water may have a value of BOD of the order of 17 ppm.
Reason R: BOD is a measure of oxygen required to oxidise both the bio-degradable and non-biodegradable organic material in water.
In the light of the above statements, choose the most appropriate answer from the options given below.
View answer and explanation
Correct option: C
A is correct but R is not correct
Option C (A is correct but R is not correct) is correct because while polluted water can have a BOD of 17 ppm, the reason provided is not entirely accurate as BOD measures biodegradable organic material only.
20 Hard
20 of 39
Remembering +4 | -1
Reducing smog is the mixture of
View answer and explanation
Correct option: A
Smoke, fog and SO2\mathrm{SO}_2
Option A (Smoke, fog and SO2\mathrm{SO}_2) is correct because reducing smog, also known as classical smog or London smog, is a mixture of smoke, fog, and sulfur dioxide.
21 Easy
21 of 39
Analyzing +4 | -1
Assertion : The archeological studies are based on the radioactive decay of carbon-14 isotope.

Reason : The ration of C−14C-14 to C−12C-12 in the animals and plants is same as that in the atmosphere.
View answer and explanation
Correct option: C
If assertion is true but reason is false.
Option C (If assertion is true but reason is false) is correct because archeological studies do rely on C-14 dating, but the ratio of C-14 to C-12 is not the same in living organisms and the atmosphere due to metabolic processes.
22 Medium
22 of 39
Remembering +4 | -1
Maximum prescribed concentration of Cd is drinking water is
View answer and explanation
Correct option: C
0.005 ppm
Option C (0.005 ppm) is correct because the maximum prescribed concentration of cadmium in drinking water is 0.005 ppm.
23 Medium
23 of 39
Analyzing +4 | -1
Assertion: The reduction in concentration of the dissolved oxygen in water is caused by eutrophication.

Reason: This is due to phosphate pollution in water.
View answer and explanation
Correct option: A
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Option A (If both Assertion and Reason are correct and Reason is the correct explanation of Assertion) is correct because eutrophication, caused by phosphate pollution, leads to a decrease in dissolved oxygen in water.
24 Medium
24 of 39
Remembering +4 | -1
The maximum prescribed concentration of manganese in drinking water is
View answer and explanation
Correct option: B
0.05 ppm
Option B (0.05 ppm) is correct because the maximum prescribed concentration of manganese in drinking water is 0.05 ppm.
25 Medium
25 of 39
Understanding +4 | -1
Identify the wrong statements in the following.
View answer and explanation
Correct option: C
Ozone layer does not permit infrared radiation from the Sun to reach the earth.
Option C (Ozone layer does not permit infrared radiation from the Sun to reach the earth) is correct because the ozone layer primarily absorbs ultraviolet (UV) radiation, not infrared radiation.
26 Hard
26 of 39
Understanding +4 | -1
S-I: Ionosphere contains gases in the ionized form which form the basis for wireless communication.
S-II: These ions reflect back the radio waves to the earth.
View answer and explanation
Correct option: A
Both S-I &\& S-II are correct
Option A (Both S-I &S−IIarecorrect)iscorrectbecausetheionospheredoescontainionizedgasesusedforwirelesscommunication,andtheseionsreflectradiowavesbacktoEarth.\& S-II are correct) is correct because the ionosphere does contain ionized gases used for wireless communication, and these ions reflect radio waves back to Earth.
27 Medium
27 of 39
Analyzing +4 | -1
Assertion: London smog is oxidising in nature.
Reason: London smog contains O3,NO2{O}_3, {NO}_2 and hydrocabons.
View answer and explanation
Correct option: D
Both Assertion and Reason are false
Option D (Both Assertion and Reason are false) is correct because London smog is reducing in nature and contains sulfur oxides and particulate matter, not ozone, nitrogen dioxide and hydrocarbons.
28 Medium
28 of 39
Remembering +4 | -1
Which pollutant above 500 ppm in drinking water causes laxative effect?
View answer and explanation
Correct option: A
Sulphate
Option A (Sulphate) is correct because sulphate in drinking water above 500 ppm can cause a laxative effect.
29 Medium
29 of 39
Understanding +4 | -1
Identify the wrong statement in the following
View answer and explanation
Correct option: D
Ozone layer does not permit infrared radiation from the sun to reach the earth
Option D (Ozone layer does not permit infrared radiation from the sun to reach the earth) is correct because the ozone layer primarily absorbs ultraviolet (UV) radiation, not infrared radiation.
30 Medium
30 of 39
Understanding +4 | -1
Pick out the correct statement?
View answer and explanation
Correct option: D
During formation of smog the level of ozone in the atmosphere goes down
Option D (During formation of smog the level of ozone in the atmosphere goes down) is correct because ozone is consumed during the formation of smog, especially photochemical smog.
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Key Takeaways

  • ✓ This set contains 39 single-correct-answer MCQs on ENVIRONMENTAL CHEMISTRY.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
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