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Air, sea water, brass and milk are all mixtures. Water, common salt and sugar are all compounds. Copper, oxygen and gold are elements. Almost every question this chapter asks is really asking you to put one substance into one of those three boxes — and then to name the technique that would pull it apart again.
The chapter earns its place in papers precisely because it is pure classification. There is nothing to derive and no formula to remember. Either you know that air is a homogeneous mixture and that brass is one too, or you don't. The separation half is just as mechanical: every technique exploits exactly one property — particle size, density, immiscibility, whether a component sublimes, or a difference in boiling point. Learn which property each technique uses, and you can answer a separation question about a mixture you have never seen in your life.
1. The Tyndall effect is used to distinguish between:
2. Which of the following is a compound and not a mixture?
3. Two miscible liquids whose boiling points differ by about 12 K are best separated by:
4. Which pair of substances can be separated by sublimation?
5. Milk is an example of which type of colloid?
6. Which of these elements is a liquid at ordinary room temperature?
7. Crystallisation is preferred over evaporation for obtaining a pure solid mainly because:
8. The size of the dispersed particles in a true solution is: