Question

What did Joseph Proust state regarding Law of Definite Proportions?

(a) A given mixture always contains absolutely the same proportion of elements by weight

(b) A given compound always contains absolutely the same proportion of moles by weight

(c) A given compound always contains absolutely the same proportion of elements by volume

(d) A given compound always contains absolutely the same proportion of elements by weight

I got this question in examination.

My enquiry is from Laws of Chemical Combination topic in chapter Chemistry Basic Concepts of Chemistry – Class 11

Answer 1

Correct choice is (d) A given compound always contains absolutely the same proportion of elements by weight

For explanation I would say: When Joseph Proust worked about the composition of elements present in a compound experimentally, he found out that it was the same for all the samples he took. Joseph Louis concluded that from any source, a particular compound always contains the same elements in the same proportion by mass/weight.