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Mohan Batra
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Asked: 2025-02-03T11:32:30+00:00 In:

Dalton’s atomic theory successfully explained. (i) Law of conservation of mass. (ii) Law of constant composition. (iii) Law of radioactivity. (iv) Law of multiple proportion.

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Poll Results

0%(a) (i), (ii) and (iii)
20%(b) (i), (iii) and (iv) ( 2 voters )
20% (c) (ii), (iii) and (iv) ( 2 voters )
60%(d) (i), (ii) and (iv) ( 6 voters )
Based On 10 Votes

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The correct answer is (d)(i), (ii) and (iv).
Dalton’s atomic theory successfully explained:
Law of Conservation of Mass(i) – Atoms are neither created nor destroyed in a chemical reaction.
Law of Constant Composition(ii) – A compound always contains the same elements in fixed proportions.
Law of Multiple Proportions(iv) – When two elements form multiple compounds, their masses combine in simple whole-number ratios.
However, Law of Radioactivity(iii) was discovered later and is not explained by Dalton’s theory.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1 Answer

    1. (d) Law of radioactivity has nothing to do with Dalton’s atomic theory.

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/

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