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Which of the following postulates of Dalton's Atomic Theory was later found to be incorrect?
Atoms of different elements have different properties.
Atoms can combine in fixed ratios to form compounds.
Atoms of the same element are identical in mass and other properties.
Atoms are indivisible and indestructible.
Answers (1)
Dalton's Atomic Theory was proposed in the early 19th century and had four postulates. At the time, it was believed that atoms were indivisible and indestructible. However, the discovery of subatomic particles later proved this postulate to be incorrect. Hence option D is the correct answer.
Option (1) is incorrect because atoms of different elements have different properties, which is still a valid postulate of Dalton's Atomic Theory. Hence option A is incorrect.
Option (2) is incorrect because atoms can combine in fixed ratios to form compounds, which is still a valid postulate of Dalton's Atomic Theory. Hence option B is incorrect.
Option (3) is incorrect because atoms of the same element are identical in mass and other properties, which is still a valid postulate of Dalton's Atomic Theory. Hence option C is incorrect.
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