Relevant Titles:
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CBSE Class 11 Chemistry MCQs – Ozone Depletion and Acid Rain (NCERT Quiz)
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Class 11 Chemistry Practice Test – Environmental Chemistry (Ozone & Acid Rain)
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NCERT MCQs on Ozone Depletion and Acid Rain – CBSE Class 11 Chemistry
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CBSE Online Test – Environmental Chemistry: Ozone and Acid Rain Questions
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Class 11 Chemistry MCQ Quiz – Ozone Layer Depletion and Acid Rain with Answers
Introduction Paragraph
Prepare for your CBSE Class 11 Chemistry exams with this NCERT-based online practice test on Ozone Depletion and Acid Rain, a key section of Chapter 14: Environmental Chemistry (Part C – Organic Chemistry). This quiz explores crucial environmental topics, including the formation and destruction of the ozone layer, CFCs and their catalytic impact on O₃ molecules, and the chemistry of acid rain involving SO₂ and NOₓ pollutants.
These MCQs are designed strictly as per the NCERT syllabus, helping students strengthen conceptual understanding for both board exams and competitive exams like NEET and JEE. With automatic scoring and per-question feedback, this quiz provides instant evaluation to improve performance.
Understand how international agreements like the Montreal Protocol reduced ozone-depleting substances, and why acid rain remains a significant environmental challenge. Strengthen your fundamentals and environmental awareness with this interactive practice test designed to boost your confidence and accuracy in Chemistry.
Sample MCQs (with Answers and Explanations)
Q1. Which compound is primarily responsible for the depletion of the ozone layer?
A) CO₂ B) SO₂ C) CFCs D) CH₄
Answer: C) CFCs
Explanation: Chlorofluorocarbons (CFCs) release chlorine radicals in the stratosphere, which catalytically destroy ozone (O₃) molecules.
Q2. The main product of the reaction between SO₂ and H₂O in the atmosphere is:
A) H₂SO₃ B) H₂SO₄ C) SO₃ D) H₂O₂
Answer: A) H₂SO₃
Explanation: Sulfur dioxide reacts with water to form sulfurous acid (H₂SO₃), which can oxidize further to sulfuric acid (H₂SO₄) in acid rain.
Q3. The Montreal Protocol, signed in 1987, aims to reduce:
A) Carbon emissions
B) CFCs and halons
C) CO₂ emissions
D) Methane emissions
Answer: B) CFCs and halons
Explanation: The Montreal Protocol regulates the production and consumption of ozone-depleting substances like CFCs, halons, and HCFCs.
Q4. Acid rain occurs when the pH of rainwater falls below:
A) 7 B) 6.5 C) 5.6 D) 8
Answer: C) 5.6
Explanation: Rainwater is naturally slightly acidic (pH ≈ 5.6) due to dissolved CO₂. Values lower than this indicate acid rain caused by SO₂ and NOₓ oxidation.
Q5. Which of the following gases is a major precursor of both acid rain and photochemical smog?
A) CO₂ B) NO₂ C) O₃ D) Ar
Answer: B) NO₂
Explanation: Nitrogen dioxide (NO₂) contributes to acid rain formation by producing nitric acid (HNO₃) and also plays a role in smog formation.
✅ Highlight:
These CBSE Class 11 Chemistry MCQs are crafted per NCERT guidelines, ideal for board exam revision and conceptual clarity in Environmental Chemistry topics such as ozone layer depletion and acid rain mechanisms.