Environmental Pollution: JAMB Chemistry Questions, Answers & Notes

What Environmental Pollution covers in the JAMB Chemistry syllabus

A pollutant harms the environment. Major air pollutants include carbon monoxide (toxic, from incomplete combustion; binds haemoglobin), sulphur dioxide and nitrogen oxides (cause acid rain, which corrodes buildings and harms life), carbon dioxide (the main greenhouse gas driving global warming), and CFCs (deplete the ozone layer that blocks harmful UV). Water pollution from sewage and fertilisers causes eutrophication (algal blooms that starve water of oxygen); oil spills harm aquatic life. Pollution is reduced by recycling, proper waste disposal, catalytic converters, and removing sulphur from fuels or scrubbing flue gases.

For Environmental Pollution, JAMB expects you to be able to:

• Identify major air and water pollutants and their sources
• Explain acid rain, the greenhouse effect, ozone depletion and eutrophication
• State the effects of pollution and ways to control it

Key facts & revision notes: Environmental Pollution

These are the recurring points our Environmental Pollution questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• A pollutant is a substance that causes harm when introduced into the environment.
• Sulphur dioxide and nitrogen oxides dissolve in rain to form acids (acid rain).
• Carbon monoxide, a toxic gas, forms from incomplete combustion of carbon fuels.
• Carbon dioxide is the main greenhouse gas contributing to global warming.
• CFCs release chlorine that destroys stratospheric ozone.
• Carbon monoxide binds strongly to haemoglobin, preventing oxygen transport in the blood.
• Nutrient-rich runoff causes eutrophication — algal blooms that deplete oxygen in water.
• The ozone layer absorbs harmful ultraviolet (UV) radiation from the Sun.
• Lead pollution comes from sources like leaded petrol (now phased out) and lead batteries.
• Sulphur dioxide is a harmful air pollutant (from burning fossil fuels).
• Acid rain corrodes buildings/statues, harms plants and makes lakes too acidic for aquatic life.
• Catalytic converters change harmful exhaust gases into less harmful ones.
• Non-biodegradable waste (e.g.
• plastics) is not broken down by microorganisms and persists.
• Recycling and proper waste management reduce pollution.
• Burning fossil fuels releases carbon dioxide, a major greenhouse gas.
• Thermal pollution is the harmful release of heat (e.g.
• warm water from industry) into the environment.
• Nitrogen makes up most of clean air and is not a pollutant; the others are pollutants.
• Sunlight reacts with nitrogen oxides and hydrocarbons from exhausts to form photochemical smog.
• Desulphurising fuels or scrubbing flue gases reduces sulphur dioxide emissions.
• Oil spills coat and poison aquatic life and birds, damaging the ecosystem.
• SO₂ and NOx dissolve in rain to form acids.
• These oxides form acidic solutions in rain.

Worked examples

Three Environmental Pollution questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Environmental Pollution is tested in JAMB Chemistry

Our Environmental Pollution bank holds 40 questions (7 easy, 23 medium, 10 hard). JAMB Chemistry typically returns to Environmental Pollution year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer Environmental Pollution questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on Environmental Pollution. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Chemistry item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at Environmental Pollution is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Environmental Pollution

The errors that cost marks on Environmental Pollution are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise Environmental Pollution actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Environmental Pollution part of the JAMB Chemistry syllabus?

Yes. Environmental Pollution is a recognised topic in the JAMB Chemistry syllabus, covering identify major air and water pollutants and their sources. You should be able to recall its key facts and apply them to multiple-choice questions.

How many Environmental Pollution questions can I practise on Belmadeng?

There are 40 original, JAMB-standard Environmental Pollution questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about Environmental Pollution?

A pollutant harms the environment. Major air pollutants include carbon monoxide (toxic, from incomplete combustion; binds haemoglobin), sulphur dioxide and nitrogen oxides (cause acid rain, which corrodes buildings and harms life), carbon dioxide (the main greenhouse gas driving global warming), and…

How do I answer Environmental Pollution questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for Environmental Pollution. Practising timed Environmental Pollution questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Chemistry Environmental Pollution questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise Environmental Pollution questions free without signing up?

Right here — tap “Start Environmental Pollution practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Chemistry syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.