The law of constant proportions was enunciated by:

Dalton

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Berthelot

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Avogadro

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Proust

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Solution

The correct option is C Proust
Proust defined the law of constant proportions. It is also called as $Proust's law$ . it states that "In a chemical substance the elements are always present in a definite proportion by mass".
Hence, the answer is option $D$ .

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The law of constant proportions was given by:

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