Is Matter Around Us Pure? · Class 9 Science · Chapter 2
🔬 Is Matter Around Us Pure?
CBSE Class 9 CBSE · Science · Chapter 1
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📖Notes Deck
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Download PDF →📝Quick Drill
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Download PDF →Top question patterns · CBSE annual / SQP aggregate
| 85% | Tabular comparison of solution / colloid / suspension on 5-6 parameters — ALWAYS draw the table — particle size, appearance, Tyndall, filterability, stability, example. 6 rows × 3 columns. Examiner-favourite. | 3 MARKS |
| 70% | Tyndall effect — definition + two daily-life examples — Definition + WHY (1-100 nm scatter light) + two examples (sunlight in dark room, headlight in fog). Memorise these two. | 3 MARKS |
| 90% | Choose the right separation technique for a given mixture — Match to particle size + miscibility: oil+water → separating funnel; NH₄Cl+NaCl → sublimation; sea water → evaporation/crystallisation; ink components → chromatography; ethanol+water → fractional distillation. | 2 MARKS |
| 75% | Mass percentage numerical with given solute + solvent masses — Write formula, add solute+solvent for solution mass, substitute, end with %. Show all 3 steps. | 2 MARKS |
| 60% | Identify pure substance / mixture / element / compound from a list — Pure = one type of particle (element OR compound). Mixture = two+ substances. Test: can it be separated by physical means? YES → mixture. | 2 MARKS |
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