Separation of Mixtures and Purification: JAMB Chemistry Questions, Answers & Notes

What Separation of Mixtures and Purification covers in the JAMB Chemistry syllabus

Mixtures are separated by physical methods chosen to suit the components. Filtration removes an insoluble solid from a liquid (residue on paper, filtrate through). Evaporation and crystallisation recover a dissolved solid (crystallisation avoids strong heating for solids that decompose). Simple distillation gives pure solvent from a solution; fractional distillation separates miscible liquids of different boiling points (ethanol/water, crude oil). A separating funnel separates immiscible liquids; a magnet separates magnetic solids; sublimation separates solids that vaporise directly; and chromatography separates dissolved coloured substances. A pure substance has a sharp melting/boiling point.

For Separation of Mixtures and Purification, JAMB expects you to be able to:

• Select appropriate methods to separate mixtures
• Describe filtration, evaporation, distillation, chromatography, sublimation and crystallisation
• Distinguish pure substances from mixtures by their fixed melting/boiling points

Key facts & revision notes: Separation of Mixtures and Purification

These are the recurring points our Separation of Mixtures and Purification questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• Filtration separates an insoluble solid from a liquid using filter paper.
• Evaporation removes the solvent, leaving the dissolved solid behind.
• Fractional distillation separates miscible liquids using their different boiling points.
• Simple distillation evaporates then condenses the water, leaving the dissolved salts behind.
• Iron is magnetic and sulphur is not, so a magnet separates them.
• Chromatography separates dissolved substances by how far they travel in a solvent.
• Sublimation separates a substance that turns directly from solid to vapour from a non-subliming solid.
• A separating funnel separates immiscible liquids by running off the denser lower layer.
• Crystallisation forms pure crystals as a hot saturated solution cools.
• Crude oil is separated into fractions by fractional distillation, based on boiling-point ranges.
• Decantation pours off the clear liquid from an insoluble solid that has settled.
• A pure substance melts and boils at a sharp, fixed temperature; impurities cause a range.
• Sand is insoluble, so filtration removes it from the water.
• The residue is the insoluble solid trapped on the filter paper; the liquid passing through is the filtrate.
• Salt dissolves; filter off the sand, then evaporate the salt solution to recover the salt.
• A condenser cools the vapour, turning it back into liquid (the distillate).
• Ethanol and water are miscible with different boiling points, so fractional distillation separates them.
• In paper chromatography, the paper is the stationary phase and the solvent is the mobile phase.
• The component with the lowest boiling point (most volatile) distils off first.
• Crystallisation avoids strong heating, so it suits solids that would decompose if evaporated to dryness.
• The filtrate is the liquid that goes through the paper.
• Filtering removes solids and distillation gives pure water.
• Solar evaporation leaves the salt behind.
• Their different boiling points allow fractional distillation.

Worked examples

Three Separation of Mixtures and Purification questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Separation of Mixtures and Purification is tested in JAMB Chemistry

Our Separation of Mixtures and Purification bank holds 40 questions (7 easy, 25 medium, 8 hard). JAMB Chemistry typically returns to Separation of Mixtures and Purification 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 Separation of Mixtures and Purification 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 Separation of Mixtures and Purification. 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 Separation of Mixtures and Purification is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Separation of Mixtures and Purification

The errors that cost marks on Separation of Mixtures and Purification 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 Separation of Mixtures and Purification actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Separation of Mixtures and Purification part of the JAMB Chemistry syllabus?

Yes. Separation of Mixtures and Purification is a recognised topic in the JAMB Chemistry syllabus, covering select appropriate methods to separate mixtures. You should be able to recall its key facts and apply them to multiple-choice questions.

How many Separation of Mixtures and Purification questions can I practise on Belmadeng?

There are 40 original, JAMB-standard Separation of Mixtures and Purification 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 Separation of Mixtures and Purification?

Mixtures are separated by physical methods chosen to suit the components. Filtration removes an insoluble solid from a liquid (residue on paper, filtrate through). Evaporation and crystallisation recover a dissolved solid (crystallisation avoids strong heating for solids that decompose). Simple dist…

How do I answer Separation of Mixtures and Purification questions quickly in JAMB?

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

Are these JAMB Chemistry Separation of Mixtures and Purification 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 Separation of Mixtures and Purification questions free without signing up?

Right here — tap “Start Separation of Mixtures and Purification 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.