Class IX

Air is regarded as a mixture because
  1. its pressure may vary
  2. its temperature may change
  3. its volume changes under different conditions
  4. its composition may vary
The process of separation of insoluble solids from a liquid is called:
  1. Filtration
  2. Decantation
  3. Crystallisation
  4. Evaporation
Which of the following is a true solution?
  1. Milk
  2. Chalk powder in water
  3. Salt solution
  4. Blood
Which out of the following is a heterogeneous mixture?
  1. air
  2. brass
  3. iodised table salt
  4. steel
Which of the following is a compound?
  1. Stainless steel
  2. Bronze
  3. Graphite
  4. Hydrogen sulphide
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