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
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (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) ভুল
Wrong: radioactivity was discovered later and contradicts indivisible atoms.
- (B) ভুল
Wrong: Dalton's theory could not explain radioactivity.
- (C) সঠিক
Correct: the theory explained conservation of mass, constant composition and multiple proportions.
- (D) ভুল
Wrong: radioactivity is not explained by it.