science
Grade-9
Easy
Question
Which of the following was not explained by Dalton’s atomic theory?
- Gases that have volume
- Law of constant proportions
- Law of conservation of mass
- Atoms are indivisible
Hint:
Dalton emphasized the theory that the same elements are known to possess the same mass.
The correct answer is: Gases that have volume
- Gases that have volume were not explained by Dalton's atomic theory.
- Dalton's atomic theory explained that all elements are formed of tiny indiscrete particles known as atoms. These atoms provide the same physical and chemical properties. They have the same size and mass as well.
- But, Dalton's atomic theory couldn't explain gases that have volumes. According to his theory, the same elements have the same mass but it is incorrect. This was later proven by Gay Lussac.
Dalton's atomic theory has many limitations including the inability to explain the presence of isotopes and allotropes.
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