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Which of the following experiments provided evidence for the postulate that atoms combine in fixed ratios to form compounds, as proposed by Dalton's Atomic Theory?
Thomson's cathode ray tube experiment
Rutherford's gold foil experiment
Millikan's oil drop experiment
Proust's law of definite proportions
Answers (1)
Proust's law of definite proportions states that in any given chemical compound, the elements are always combined in fixed ratios by mass. This observation provided evidence for Dalton's postulate that atoms can combine in fixed ratios to form compounds. Hence option D is the correct answer.
Option (1) is incorrect because Thomson's cathode ray tube experiment provided evidence for the existence of subatomic particles, but it did not directly provide evidence for the postulate in question. Hence option A is incorrect.
Option (2) is incorrect because Rutherford's gold foil experiment provided evidence for the existence of a nucleus within an atom, but it did not directly provide evidence for the postulate in question. Hence option B is incorrect.
Option (3) is incorrect because Millikan's oil drop experiment provided evidence for the charge of the electron, but it did not directly provide evidence for the postulate in question. Hence option C is incorrect.
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