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 proportions
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Answer: (C) i, ii and iv
Dalton's indivisible-atom theory explained the laws of chemical combination, not radioactivity (which shows atoms can break down).
- (A) Incorrect
Wrong: radioactivity was discovered later and contradicts indivisible atoms.
- (B) Incorrect
Wrong: Dalton's theory could not explain radioactivity.
- (C) Correct
Correct: the theory explained conservation of mass, constant composition and multiple proportions.
- (D) Incorrect
Wrong: radioactivity is not explained by it.