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CBSE Class 9 Science Question 3 of 11

Is Matter Around Us Pure — Question 5

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Question 5

Classify each of the following as a homogeneous or heterogeneous mixture.

Soda water, wood, air, soil, vinegar, and filtered tea.

Answer

The given elements are classified below:

  1. Soda water — Homogenous mixture
  2. Wood — Heterogeneous mixture
  3. Air — Heterogeneous mixture
  4. Soil — Heterogeneous mixture
  5. Vinegar — Homogenous mixture
  6. Filtered tea — Homogenous mixture
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Science | Chapter 2: Is Matter Around Us PureWeb Content — Quick Reference

Chapter 2: Is Matter Around Us Pure — Quick Reference

mixtures solutions colloids suspensions separation techniques elements compounds Tyndall effect

Quick Revision Points

  • Pure substances: fixed composition (elements + compounds). Mixtures: variable composition
  • Solution (< 1 nm, transparent), Colloid (1-100 nm, Tyndall effect), Suspension (> 100 nm, settles)
  • Concentration = (mass of solute / mass of solution) × 100
  • Separation: evaporation, centrifugation, chromatography, distillation, sublimation, crystallisation, separating funnel
  • Elements: metals, non-metals, metalloids. Compounds: fixed ratio, chemical separation
  • Tyndall effect: scattering of light by colloidal particles (milk, fog, smoke)
Exam Tips for Chapter 2
  • Read the detailed chapter notes for complete coverage of all NCERT topics.
  • Practice all NCERT in-text and back exercise questions — they are frequently asked in exams.
  • Focus on comparison tables, diagrams, and definitions — these are high-scoring areas.
  • For numericals (if applicable), practice at least 20 problems of varying difficulty.
  • Refer to the practice question bank (200+ questions) for thorough preparation.
Related Resources
  • Detailed Notes: ch02-is-matter-around-us-pure.html
  • Practice Questions: 100+ questions with answers in 05-practice-questions/
  • Chapter Test: 30-mark test paper in 06-tests/chapter-tests-30marks/
  • Formula Sheet: Complete formula reference in 03-teacher-aid/formula-sheet.html
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