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State PCS PYQPrelims 2024

BPSC – Combined Competitive Examination · Question 1

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

  1. ii, iii and iv
  2. i, ii and iii
  3. i, ii and iv
  4. i, iii and iv
Show answer & explanation

Answer: (C) i, ii and iv

Explanation

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.