Which one of the following is not explained by the Dalton's atomic theory?

  1. A. Law of conservation of mass
  2. B. Law of constant composition
  3. C. Presence of different kind of sub-atomic particles in an atom
  4. D. Law of multiple proportion

Correct Answer: C. Presence of different kind of sub-atomic particles in an atom

Explanation

Dalton's theory considered the atom to be indivisible and did not account for sub-atomic particles like electrons, protons, and neutrons.

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