What did Joseph Proust state regarding Law of Definite Proportions?

Who proposed the Law of Definite Composition?

Which of the following statement is correct?

Which of the following is not a law of chemical combination?

Who proposed that equal volumes of all gases at the same temperature & given pressure should contain an equal numbe…

The volumes of hydrogen & oxygen when combined bear a simple ratio of 2:1.This is explained by ____

Compounds cannot be separated by chemical methods.

Which of the following is not a pure substance?