Who proposed the law of constant proportions?

John Dalton

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Joseph Proust

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Antoine Lavoisier

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Ernest Rutherford

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Solution

The correct option is B Joseph Proust
The French scientist J. L. Proust proposed the law of constant proportions. It state that: a chemical compound always contains the same elements combined together in the same proportion by mass.

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Who among the following established the laws of constant proportions?

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