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.