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Atoms and Molecules

NCERT 9th Class (CBSE) Science: Atoms and Molecules Quiz

NCERT 9th Class (CBSE) Science: Atoms and Molecules Quiz

20 Multiple Choice Questions related to NCERT 9th Class (CBSE) Science: Atoms and Molecules Quiz:

  • In a chemical substance the elements are always present in definite proportions by mass.
    E.g., In water, the ratio of the mass of hydrogen to the mass of oxygen H : O is always 1:8
  • The smallest particle of matter, which can take part in a chemical reaction is called atom.
  • The smallest particle of an element or compound which can exist independently is called molecule.
  • The number of atoms constituting a molecule is known as its atomicity.
  • John Dalton coined the term atom.

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