Q. Which of the following statements regarding the law of constant proportion are correct?- It was given and stated by Lavoisier.
- In a chemical substance, the elements are always present in definite proportions by mass.
Select the correct answer using the codes given below:
Answer:
Only 2
Notes: The law of constant proportion states that a chemical compound always contains its constituent elements in a fixed proportion by mass. This law was formulated by Joseph Proust, not by Lavoisier. Lavoisier contributed to defining elements and compounds, but the law itself is attributed to Proust.