Class IX

Size of colloidal particles in a solution is
  1. more than 100 nm
  2. less than 1 nm
  3. between 1 to 100 nm
  4. between 100 to 1000 nm
Which of the following is a metalloid?
  1. Germanium
  2. Gallium
  3. Carbon
  4. Sodium
When a beam of light is passed through a colloidal solution, it gets:
  1. reflected
  2. absorbed
  3. scattered
  4. refracted
An atom is
  1. the smallest particle of matter known
  2. the smallest particle of a gas
  3. the smallest indivisible particle of an element that can take part in a chemical change
  4. radioactive emission
The number of metals which exist as gas is/are
  1. one
  2. two
  3. three
  4. none
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