Relevant Titles
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CBSE Class 11 Chemistry – Environmental Chemistry MCQs with Answers
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NCERT MCQs on Environmental Chemistry for Class 11 Board Preparation
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CBSE Class 11 Online Quiz: Environmental Chemistry Practice Test
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Environmental Chemistry Class 11 MCQs – NCERT-Based Practice Questions
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CBSE Class 11 Chemistry MCQs: Pollution, Greenhouse Effect & BOD Explained
Introduction
Prepare for your CBSE Class 11 Chemistry exams with this comprehensive NCERT-based online test on Environmental Chemistry (Chapter 14, Part C: Organic Chemistry). This quiz covers essential concepts including air, water, and soil pollution, greenhouse effect, acid rain, photochemical smog, BOD and COD, and environmental protection strategies. Designed in alignment with the NCERT syllabus, these multiple-choice questions (MCQs) help students strengthen conceptual clarity and exam readiness. Each question includes detailed explanations to support learning and quick revision before tests.
Environmental Chemistry connects Chemistry to real-life applications like pollution control, waste management, and sustainable chemistry. Practicing these MCQs enhances analytical thinking and board exam performance. Whether you’re revising for your school exams or preparing for competitive tests like JEE or NEET, this practice quiz ensures a solid understanding of key environmental principles. Ideal for self-study, online assessment, or classroom practice.
Sample MCQs (with Answers and Explanations)
Q1. Which gas is primarily responsible for the greenhouse effect and global warming?
A) O₂ B) CO₂ C) N₂ D) SO₂
Answer: B) CO₂
Explanation: Carbon dioxide is the major greenhouse gas, trapping infrared radiation and raising the Earth’s average temperature, contributing to global warming.
Q2. Acid rain is mainly caused by which pollutants in the atmosphere?
A) CO₂ and O₃ B) SO₂ and NO₂ C) CH₄ and CO D) H₂S and Cl₂
Answer: B) SO₂ and NO₂
Explanation: Sulfur and nitrogen oxides react with atmospheric water to form H₂SO₄ and HNO₃, resulting in acid rain with a pH below 5.6.
Q3. What does BOD (Biochemical Oxygen Demand) indicate in water pollution analysis?
A) Amount of dissolved oxygen present
B) Oxygen used by microorganisms to decompose organic matter
C) Chemical oxygen present
D) Oxygen used in photosynthesis
Answer: B) Oxygen used by microorganisms to decompose organic matter
Explanation: Higher BOD means more organic waste and lower water quality, making it a key parameter for assessing pollution levels.
Q4. Which chemicals are mainly responsible for the depletion of the ozone layer?
A) CO₂ and CH₄ B) CFCs (chlorofluorocarbons) C) NO₂ and H₂O D) O₃ and CO
Answer: B) CFCs
Explanation: Chlorofluorocarbons release chlorine radicals that destroy ozone molecules in the stratosphere, leading to the ozone hole phenomenon.
Q5. What does the “3R” principle in environmental management stand for?
A) Reduce, Reuse, Recycle
B) React, Reform, Rebuild
C) Remove, Restore, Reuse
D) Recover, Recycle, Remove
Answer: A) Reduce, Reuse, Recycle
Explanation: The 3R principle minimizes waste generation and promotes sustainable environmental practices by reducing resource consumption.
✅ Highlight: These MCQs strictly follow the NCERT Class 11 Chemistry syllabus, making them ideal for CBSE board preparation and conceptual revision.