Lesson eLearning

Which of the following is a pure substance?

easy MCQ 1 mark Class 9 · Science · Is Matter Around Us Pure
  1. Water (H₂O)
  2. Salt water
  3. Sand
  4. Air
Answer
Water (H₂O)

The correct answer is Water (H₂O) — Water (H₂O) contains only H₂O molecules; it is a pure substance.

Step-by-step solution

  1. Identify the component that consists of only one type of molecule.
  2. Water (H₂O) contains only H₂O molecules; it is a pure substance.
Common mistake: Confusing salt water with pure water

Concept tested: Identify pure substance

Published · How this solution was prepared and checked

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