Class IX

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
Which of the following is a compound?
  1. Stainless steel
  2. Bronze
  3. Graphite
  4. Hydrogen sulphide
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 colloid?
  1. Aluminium paint
  2. Blood
  3. Milk
  4. All
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
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