Multiple choice

Which among the following can be excluded form the drawbacks of Dalton's atomic theory of matter?

  1. It failed to explain the existence of allotropes.

  2. It failed to explain the laws of chemical combination.

  3. It failed to explain the divisibility of an atom.

  4. It failed to explain the different nature of atoms of same element .
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D Correct answer
Explanation

According to Dalton, the atoms of same element are similar in all respects. This is wrong because atoms of some elements vary in their mass and density. Such atoms of the same element having different masses are called isotopes. For example, chlorine has two isotopes having mass numbers 35 a.m.u and 37 a.m.u..

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