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
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
Which of the following is not a compound?
  1. marble
  2. washing soda
  3. quick lime
  4. brass
The mixture will appear translucent in case of:
  1. CuSO4 + water
  2. alum + water
  3. sugar + water
  4. starch + water
The number of metals which exist as gas is/are
  1. one
  2. two
  3. three
  4. none
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