NCERT Solutions Class 9 Science Chapter 5 Mixtures 2026-27

Chapter 5 Exploring Mixtures and their Separation is one of the most scoring chapters in the new Class 9 Science book. The NCERT Solutions for Class 9 Science Chapter 5 Exploring Mixtures and their Separation on this page solve all 17 Revise, Reflect, Refine questions for the 2026-27 session. Every answer gives the concept used, the full working, and an expert shortcut. You get MCQs, assertion-reason, concentration numericals, and separation-method questions in one place.

• Question count: 17 fully solved questions, covering MCQs, assertion-reason, three concentration numericals and separation-method questions.
• Concepts covered: homogeneous vs heterogeneous mixtures, solution-suspension-colloid, Tyndall effect, percentage concentration and eight separation methods.
• Format: each answer shows the concept, full working and an expert shortcut, matched to the 2026-27 NCERT Exploration book.

Every NCERT solution for Class 9 Science Chapter 5 in this Collegedunia set is written by science teachers, matched to the 2026-27 NCERT Exploration book, and checked against the official answer key.

Exploring Mixtures Class 9 Explained in Simple Language

Source: Magnet Brains on YouTube

How Collegedunia's NCERT Solutions Help You With Exploring Mixtures and their Separation

These solutions do more than give the final answer. Each one names the property that matters, works the numbers in full, and adds an expert tip that saves time in the exam. That is exactly how a Class 9 unit test or the CBSE-style periodic test rewards you.

• 2026-27 NCERT alignment: answers follow the new Exploration book and its Revise, Reflect, Refine exercise, so nothing extra or outdated slips in.
• Full working shown: every concentration sum is done step by step, from the formula to the final value, with a built-in check that the parts add up to 100%.
• Diagrams where they help: the distillation set-up, separating funnel and chromatography are shown with labelled figures from the NCERT book.
• Expert shortcuts: a second expert solution gives a faster route, such as ruling out true solutions first in a Tyndall-effect question.

What the Class 9 Science Exploring Mixtures and their Separation PDF Contains

The PDF is a clean, printable copy of everything on this page. It is handy for last-day revision because it puts the concept, the working and the expert tip for each question on one line of sight.

• All 15 Revise, Reflect, Refine questions, in the exact order of the NCERT book.
• Both Pause and Ponder concentration problems from inside the chapter.
• A quick-recall table of the three concentration formulas and the eight separation methods.

Types of Mixtures in Exploring Mixtures and their Separation: Homogeneous and Heterogeneous

A mixture is two or more substances mixed without a fixed ratio. The first job of this chapter is to sort mixtures into two groups. A homogeneous mixture is uniform all through, with no visible boundary, like a sugar solution or an alloy. A heterogeneous mixture has parts you can tell apart, like muddy water or smoke.

• Homogeneous examples: air, sugar solution, vinegar, copper sulfate solution, salt solution, brass and bronze (alloys are solid solutions).
• Heterogeneous examples: muddy water, milk, smoke, fog, blood and butter.
• Common trap: milk, smoke, fog and blood look uniform but are colloids, so they are heterogeneous, not homogeneous.

Solution, Suspension and Colloid Compared by Particle Size

The whole difference between a solution, a suspension and a colloid comes down to one thing: particle size. Fix the two boundaries at 1 nm and 1000 nm, and every other property, such as settling, filtering and light scattering, follows straight from where the mixture sits on that scale.

Read the table down the size row first. Once you know a mixture is small, medium or large, the other rows are fixed for you.

The Tyndall Effect: Why Only Colloids and Suspensions Scatter Light

The Tyndall effect is the scattering of a beam of light by the particles in a mixture, which makes the beam visible. It happens only when particles are big enough to scatter light, that is in colloids and suspensions. A true solution has particles smaller than 1 nm, which are too small to scatter, so it shows no Tyndall effect.

• Air and dust: shows the effect (large suspended dust particles scatter light).
• Starch and water: shows the effect (starch forms a colloid).
• Copper sulfate and water: no effect (a true solution, even though it is deep blue).
• Acetone and water: no effect (fully miscible, a true solution).

Remember: it is size, not colour, that decides scattering. A deep blue copper sulfate solution still shows no Tyndall effect.

Concentration Formulas Every Class 9 Student Must Know

Concentration tells you how much solute is present in a given amount of mixture. Every concentration sum in this chapter is the same idea: a part divided by the whole, times 100. Pick the right formula by looking at whether the amounts are masses or volumes.

The most common slip is dividing by the wrong number. For % m/m, the denominator is the total mass of the mixture, never the mass of one other ingredient. A useful check is that the percentages of all parts of a mixture must add up to 100%.

Separation Methods in Exploring Mixtures and their Separation, from Filtration to Chromatography

To separate a mixture, first ask one question: in what property do the parts differ? That property, whether it is solubility, particle size, boiling point or density, names the method for you. This chapter uses eight standard methods.

Exam tip: when three solids are mixed, such as sand, salt and naphthalene, always sublime the naphthalene first while the mixture is dry, then dissolve the salt, filter off the sand, and finally evaporate to get the salt back.

Solubility and Saturated Solutions in the Class 9 Solubility Table

Solubility is the largest mass of a salt that dissolves in 100 g of water at a given temperature to make a saturated solution. For most salts, solubility rises with temperature. So a solution that is saturated when hot holds too much salt when cooled, and the extra salt crystallises out.

• To scale a table value to any amount of water, multiply by (mass of water ÷ 100). For 50 g of water, just halve the value.
• Potassium nitrate jumps from 21 to 167 g per 100 g of water between 10°C and 80°C, the largest change of the four salts.
• Common salt barely moves, from 36 to 37 g, which is why sea salt is made by evaporation, not by cooling.

Common Mistakes Students Make in Exploring Mixtures and their Separation

Revise, Reflect, Refine Exercise Coverage for Class 9 Science Chapter 5

The table below maps the Revise, Reflect, Refine questions to the skill each one tests, so you can revise by topic instead of in a straight line.

Other Class 9 Science Chapter 5 Resources

Also Check: use these sister resources for the same chapter alongside the solutions.

NCERT Solutions for Other Class 9 Science Chapters

Related Links: continue your Class 9 Science revision with the solutions for other chapters.