The law of definite proportions was given by _____________.

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Proust

Humphry davy

John Dalton

Michael Faraday

answer is C.

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Detailed Solution

The Law of Constant Composition, discovered by Joseph Proust, is also known as the Law of Definite Proportions.
The law states that in a chemical substance, the elements are always present in definite proportions by mass.
This means that the ratio of the masses of the constituent elements in a given compound is always the same, regardless of the source of the compound or how it was prepared.
For example, water (H₂O) always consists of two parts hydrogen and one part oxygen by mass, no matter where the water comes from or how it was produced.

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