Question

Which of the following is correct statement of 'Law of Definite Proportion' -
(a) Atoms combine in small whole number ratio to form compound.
(b) Same elements combine together in fix proportion by mass to form compound.
(c) Same elements combine together in fix proportion by number to form compound.
(d) Same kind of atoms combine in fix proportion by number to form compound.​

Answer 1

In chemistry, the law of definite proporation, sometimes called Proust's law, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio and does not depend on its source and method of preparation.

So, your answer is the second one is correct . = Same elements combine together in fix proporation by mass to form compound.