Class IX

The process used to separate oil and water is
  1. Distillation
  2. Sublimation
  3. Separating funnel
  4. Chromatography
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
Cloud is an example of
  1. liquid dispersed in a gas
  2. solid dispersed in a gas
  3. liquid dispersed in a solid
  4. solid dispersed in a solid
Which of the following will show Tyndall effect?
  1. Milk
  2. Salt solution
  3. Vinegar
  4. Sulphur in water
When iron and sulphur are heated at high temperature
  1. Black coloured FeS is formed
  2. Mixture of iron and sulphur is obtained
  3. Yellow coloured iron sulphide is formed
  4. They do not heat.
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