Top Environmental Chemistry Questions for NEET
Environmental Chemistry is a relatively small yet highly scoring chapter for NEET. Most questions are directly based on NCERT facts, definitions, and environmental processes such as pollution, ozone depletion, and water treatment. Practicing the Top 5 Environmental Chemistry Questions ensures quick revision and easy marks in the exam.
Why Environmental Chemistry is Important for NEET
Environmental Chemistry is one of the most straightforward chapters. NEET questions are usually factual and concept-based, making it a high-return topic with minimal effort. By mastering the Top 5 Environmental Chemistry Questions, you can confidently attempt direct questions without spending too much time.
Top 5 Environmental Chemistry Questions (NCERT-Based PYQs)
Question 1: Ozone Depletion
Which compound is mainly responsible for ozone layer depletion?
A. CO₂
B. SO₂
C. CFCs
D. NO₂
Answer: C
Explanation:
Chlorofluorocarbons (CFCs) release chlorine radicals in the stratosphere, which catalytically destroy ozone molecules. This is one of the most commonly asked concepts in the Top 5 Environmental Chemistry Questions.
Question 2: Photochemical Smog
Photochemical smog is formed due to:
A. Reaction of SO₂ with water
B. Reaction of hydrocarbons and NOx in sunlight
C. Burning of coal
D. Industrial emissions only
Answer: B
Explanation:
Photochemical smog forms when nitrogen oxides (NOx) and hydrocarbons react under sunlight to produce ozone and other oxidants. This concept is directly from NCERT and frequently appears in the Top 5 Environmental Chemistry Questions.
Question 3: BOD (Biochemical Oxygen Demand)
What does high BOD indicate?
A. Clean water
B. High oxygen content
C. High organic pollution
D. Low microbial activity
Answer: C
Explanation:
BOD measures the amount of oxygen required by microorganisms to decompose organic matter. High BOD indicates high pollution. This is a key concept in the Top 5 Environmental Chemistry Questions.
Question 4: Acid Rain
Acid rain is mainly caused by:
A. CO₂ and CH₄
B. SO₂ and NO₂
C. O₃ and CO
D. NH₃ and H₂S
Answer: B
Explanation:
Sulfur dioxide and nitrogen dioxide react with water in the atmosphere to form sulfuric and nitric acids, leading to acid rain. This is one of the most repeated Top 5 Environmental Chemistry Questions.
Question 5: Eutrophication
Eutrophication is caused by:
A. Decrease in nutrients
B. Excess nutrients in water
C. Increase in oxygen
D. Decrease in algae
Answer: B
Explanation:
Excess nutrients (like nitrates and phosphates) lead to excessive growth of algae, which depletes oxygen and harms aquatic life. This is a frequently asked concept in the Top 5 Environmental Chemistry Questions.
Key Concepts You Must Remember
To master the Top 5 Environmental Chemistry Questions, focus on types of pollution (air, water, soil), major pollutants, and their sources. Understand ozone depletion, greenhouse effect, acid rain, and water treatment methods. Most questions are directly picked from NCERT lines, so thorough reading is essential.
Additional Practice Questions (Concept-Based Rapid Revision)
Question 6
Which gas is responsible for greenhouse effect?
Answer: CO₂
Question 7
Which pollutant causes blue baby syndrome?
Answer: Nitrates
Question 8
Which layer protects us from UV radiation?
Answer: Ozone layer
Question 9
What is the main source of SO₂?
Answer: Burning of fossil fuels
Question 10
Which gas is released from incomplete combustion?
Answer: CO
Additional Practice Questions with Solutions
Question 11
Why is CO dangerous?
Solution:
CO binds with hemoglobin to form carboxyhemoglobin, reducing oxygen transport in blood.
Question 12
Why does eutrophication decrease oxygen levels?
Solution:
Decomposition of algae consumes dissolved oxygen, harming aquatic life.
Question 13
Why are CFCs harmful?
Solution:
They release chlorine radicals that destroy ozone molecules.
Question 14
Why is acid rain harmful to monuments?
Solution:
Acids react with calcium carbonate in marble, causing corrosion.
Question 15
Why is BOD used to measure pollution?
Solution:
It indicates the amount of organic matter present in water.
Final Revision Tips
To score well in the Top 5 Environmental Chemistry Questions, revise NCERT thoroughly and focus on definitions and examples. Avoid overcomplicating this chapter—most questions are direct. Regular revision of the Top 5 Environmental Chemistry Questions will help you secure quick marks in NEET.
Consistent practice of the Top 5 Environmental Chemistry Questions ensures strong retention and accuracy during the exam.