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Question

Which of the following is/are the incorrect postulate(s) of the Dalton's atomic theory?

I) An atom is the smallest particle and is indivisible.
II) Atoms of all elements are identical.
III) Atoms can neither be created nor be destroyed.

A
Only I
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B
Only III
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C
Both II and III
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D
Only II
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Solution

The correct option is D Only II
According to the Dalton's atomic theory:
  • An atom is the smallest particle which cannot be divided further, i.e., it is indivisible.
  • Atoms of the same elements have same mass and chemical properties. Whereas, atoms of different elements have different mass and chemical properties.
  • Atoms can neither be created nor be destroyed. They are just rearranged in a chemical reaction.
Thus, statement II is incorrect as per the Dalton's atomic theory.

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