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ICSE Class 7 Chemistry Question 10 of 20

Air & Atmosphere — Question 13

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Question

Question 13

State four different properties of a compound and a mixture. With reference to the stated properties give reasons why air is considered a mixture and not a compound.

Answer

Four Properties of compounds:

  1. It has a fixed composition.
  2. It has definite set of properties.
  3. It cannot be separated by physical means.
  4. Chemical Formula possible.

Four Properties of mixture:

  1. It has a variable composition.
  2. It has no definite properties.
  3. It cannot be separated by physical means.
  4. No chemical formula possible.

Air is considered a mixture and not a compound because:

  1. Composition — Air has a variable composition
  2. Properties — Air has no specific set of properties
  3. Separation of components — Air can be separated into its components by physical means
  4. Chemical formula — No chemical formula is possible for air.