Class IX

The smell of hydrogen sulphide (HS) gas is
  1. pleasant
  2. rotten eggs
  3. of burning sulphur
  4. None of these
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.
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 out of the following is a heterogeneous mixture?
  1. air
  2. brass
  3. iodised table salt
  4. steel
Which of the following will show Tyndall effect?
  1. Milk
  2. Salt solution
  3. Vinegar
  4. Sulphur in water
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