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Q: Who among the following scientists propounded the law of constant ratio?
  • A. Antoine Lavoisier
  • B. Joseph Proust
  • C. Robert Boyle
  • D. Jacques Charles
Correct Answer: Option B - Joseph Proust formulated the 'constant ratio or fixed ratio law'. According to this law, each element of a chemical compound is always found in a certain proportion according to its mass, by whatever method the compound is obtained.
B. Joseph Proust formulated the 'constant ratio or fixed ratio law'. According to this law, each element of a chemical compound is always found in a certain proportion according to its mass, by whatever method the compound is obtained.

Explanations:

Joseph Proust formulated the 'constant ratio or fixed ratio law'. According to this law, each element of a chemical compound is always found in a certain proportion according to its mass, by whatever method the compound is obtained.