Question

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

• A. (i), (ii) and (iii)
• B. (i), (iii) and (iv)
• C. (ii), (iii) and (iv)
• D. (i), (ii) and (iv)

Answer 1

The correct option is D

(i), (ii) and (iv)

Explanation for correct option:

Option D: (i), (ii) and (iv):

Postulates of Dalton's atomic are:

1. Atoms are indivisible particles and atoms can neither be created not be destroyed. This postulate explains the law of conservation of mass.
2. The law of conservation of mass states that mass can neither be created nor be destroyed.
3. Atoms of different elements combine in fixed ratios to form different molecules. This postulate explains the law of definite proportions as well as the law of multiple proportions.
4. The law of definite proportions states that atoms of different elements combine in fixed ratios to form different molecules.
5. The law of multiple proportions states that when two elements combine to form more than one compound, weight of one element that combines with fixed weight of other are in ratio of small whole numbers.

Thus, statements (i), (ii) and (iv) are correct.

Explanation for incorrect options:

Option A: (i), (ii) and (iii):

Dalton's atomic theory does not explain the law of radioactivity.

Option B: (i), (iii) and (iv):

Dalton's atomic theory does not explain the law of radioactivity.

Option C: (ii), (iii) and (iv):

Dalton's atomic theory does not explain the law of radioactivity.

Thus, Option (D) is the correct option.