Class IX

Which of the following is not a compound?
  1. marble
  2. washing soda
  3. quick lime
  4. brass
The number of metals which exist as gas is/are
  1. one
  2. two
  3. three
  4. none
Which of the following is not a noble gas?
  1. Helium
  2. Neon
  3. Argon
  4. Hydrogen
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
When a beam of light is passed through a colloidal solution, it gets:
  1. reflected
  2. absorbed
  3. scattered
  4. refracted
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