Which of the following postulates of Dalton's atomic theory explains the law of definite proportion?

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Atoms of two elements may combine with one another to form more than one compound.

Atoms combine in the ratio of small whole numbers to form compounds.

The relative number and kinds of atoms are constant in a given compound.

All of the above.

answer is C.

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Detailed Solution

The law of definite proportions states that individual elements that constitute a chemical compound are always present in a fixed ratio. The relative number and kind of atoms in a compound remain constant. This explains the law of definite proportion. For example, in carbon dioxide (CO₂), the ratio of carbon and oxygen will always remain constant, i.e. 1:2, irrespective of where the sample of carbon dioxide is taken from.

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