According to Dalton’s atomic theory,an atom

Statement $1$: The mass ratio of hydrogen to oxygen in water obtained from rivers,wells,lakes,or seas is always $1:8$.
Statement $2$: In $1799$,the scientist Joseph Proust proposed the Law of Definite Proportions.

Atoms combine in chemical reactions to form:

Carbon and oxygen form two known compounds. One compound contains $42.9\%$ carbon,while the other contains $27.3\%$ carbon. This illustrates the law of:

Amongst the following statements,which one was not proposed by $Dalton$?

Gay-Lussac's law of gaseous volumes is derived from $.......$.