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Q.

Who proposed the law of constant proportions first?

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a

Joseph Proust

b

Antoine Lavoisier

c

James Dalton

d

Niels Bohr

answer is A.

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Detailed Solution

The law of constant proportions, also known as the law of definite proportions, states that a chemical compound always contains the same elements in the same proportions by mass. This law was first proposed by the French chemist Joseph Louis Proust in 1799.

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