Chapter Exam

Chapter-13 Air Water and Environment — Online MCQ Test

Q: What is the approximate percentage of nitrogen in dry air?

Answer: B. 78% — Nitrogen comprises approximately 78% of dry air, making it the most abundant gas in the atmosphere.

Q: Which gas is primarily responsible for the greenhouse effect?

Answer: C. Carbon dioxide — Carbon dioxide is the main greenhouse gas that traps heat in the atmosphere and contributes to global warming.

Q: When water is treated using chlorine, what is its primary purpose?

Answer: B. Kill harmful microorganisms — Chlorine is a disinfectant used to kill harmful microorganisms and pathogens present in water, making it safe for consumption.

CHEMISTRY · Grade 10 · IGCSE cambridge

Practice Chapter-13 Air Water and Environment with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 CHEMISTRY. This chapter covers: Composition of air water treatment pollution greenhouse gases and environmental chemistry.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-13 Air Water and Environment — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 CHEMISTRY — Chapter-13 Air Water and Environment, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the approximate percentage of nitrogen in dry air?

A. 21%
B. 78% ✓
C. 0.04%
D. 1%

Answer: B. 78%
Nitrogen comprises approximately 78% of dry air, making it the most abundant gas in the atmosphere.

Which gas is primarily responsible for the greenhouse effect?

A. Nitrogen
B. Oxygen
C. Carbon dioxide ✓
D. Helium

Answer: C. Carbon dioxide
Carbon dioxide is the main greenhouse gas that traps heat in the atmosphere and contributes to global warming.

When water is treated using chlorine, what is its primary purpose?

A. Remove dissolved salts
B. Kill harmful microorganisms ✓
C. Increase water hardness
D. Remove suspended particles

Answer: B. Kill harmful microorganisms
Chlorine is a disinfectant used to kill harmful microorganisms and pathogens present in water, making it safe for consumption.

Compare the environmental impact of burning fossil fuels with renewable energy sources. Which statement is most accurate?

A. Both produce identical amounts of greenhouse gases
B. Fossil fuels release stored carbon as CO₂, while renewables produce minimal emissions ✓
C. Renewable sources produce more pollution than fossil fuels
D. Neither affects atmospheric composition

Answer: B. Fossil fuels release stored carbon as CO₂, while renewables produce minimal emissions
Burning fossil fuels releases carbon that was stored for millions of years, significantly increasing atmospheric CO₂. Renewable sources like solar and wind produce negligible emissions during operation.

A factory releases nitrogen oxides (NOₓ) and sulfur dioxide (SO₂) into the atmosphere. Which multi-step environmental consequence would most likely occur? (Select the most comprehensive chain of events)

A. Direct formation of ground-level ozone only
B. Formation of acid rain, soil acidification, and water pollution; deposition damages ecosystems and corrodes building materials ✓
C. Immediate cooling of the stratosphere
D. Increased plant growth due to nutrient enrichment

Answer: B. Formation of acid rain, soil acidification, and water pollution; deposition damages ecosystems and corrodes building materials
NOₓ and SO₂ form acids in the atmosphere (acid rain), which acidifies soil and water, damages ecosystems, and corrodes infrastructure—a well-documented multi-stage environmental problem.

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