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Is Matter Around Us Pure? — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?1 Mark
Question
One of the following is a solid foam. This one is:
  1. Butter.
  2. Bread.
  3. Shaving cream.
  4. Ruby.
✓

Answer

  1. Bread.

Explanation:

Solid foam is a colloid in which a gas is dispersed in a solid medium. Bread is an example of solid foam.

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