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Which postulate of Dalton’s atomic theory explains the Law of Definite Proportions?
Question

Which postulate of Dalton’s atomic theory explains the Law of Definite Proportions?

A.

Atoms of different elements have different masses and properties.

B.

Atoms of the same element are identical in mass and size.

C.

Atoms are indivisible and indestructible.

D.

Atoms combine in simple whole-number ratios to form compounds.

Correct option is D


The correct answer is (d) Atoms combine in simple whole-number ratios to form compounds
Explanation:
• Law of Definite Proportions states fixed composition of compounds.
• Dalton explained this using fixed atomic ratios.
• Chemical combination follows simple numerical relationships.
Information Booster:
• Supports law proposed by Joseph Proust.
• Foundation for modern stoichiometry concepts.
Additional Knowledge (Incorrect Options):
(a) Different masses
• Explains elemental distinction, not proportions.
(b) Identical atoms
• Relates to elemental uniformity.
(c) Indivisible atoms
• Later disproved by subatomic particles.

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