All samples of carbon dioxide contain carbon and oxygen in the mass ratio of $3 : 8$ . This is in agreement with the law of :

conservation of mass

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constant proportion

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multiple proportions

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gaseous volumes

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Solution

The correct option is B constant proportion
LAW OF CONSTANT OR DEFINITE PROPORTION : It was given by Proust.
It states that all chemical compounds are found to have constant composition irrespective of their method of preparation or sources.
THE LAW OF MULTIPLE PROPORTION : It was given by Dalton.
It states that when one element combines with the other element to form two or more different compounds, the mass of one element which combines with a constant mass of the other bear a simple ratio to one another.

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All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3:8. This is in agreement with the law of :

All samples of carbon dioxide contain carbon and oxygen in the mass ratio of $3 : 8$ . This is in agreement with the law of :