Class IX

Which of the following will show Tyndall effect?
  1. Milk
  2. Salt solution
  3. Vinegar
  4. Sulphur in water
The size of the colloidal particle is in the range of
  1. 1 Å to 100 Å
  2. 1 nm to 100 nm
  3. 10-9 m to 10-6 m
  4. 10-9 cm to 10-7 cm
Which of the following is a compound?
  1. Stainless steel
  2. Bronze
  3. Graphite
  4. Hydrogen sulphide
The Brownian movement in colloids is due to:
  1. Tyndall effect
  2. Charge on colloidal solution
  3. Collisions between colloidal particles and with dispersion medium
  4. All 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.
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