​Which of the following scientists proposed the 'Law of Constant Proportions'?​

Correct option is B

• The Law of Constant Proportions, also known as Proust's Law, was proposed by Joseph Proust in 1797.
• This law states that a chemical compound always contains the same elements in the same proportions by mass, regardless of the quantity or source of the compound.

• Joseph Proust conducted experiments that led to the formulation of the Law of Constant Proportions, showing that water (H₂O) always contains 11.11% hydrogen and 88.89% oxygen by mass.

• This law helped in the development of the concept of chemical formulas and the idea that compounds are composed of a fixed ratio of elements.

• The law was a major step forward in the development of modern chemistry, providing key insight into the fixed nature of chemical compounds.

• It laid the groundwork for later discoveries, such as Avogadro’s Law, which further explained the relationship between the volume of gases and the number of molecules.

Additional Information:

• JJ Thomson: Known for his discovery of the electron and the development of the plum pudding model of the atom.

• Ernest Rutherford: Discovered the nucleus of the atom through his gold foil experiment and proposed the planetary model of the atom.

• E Goldstein: Discovered the canal rays (positive rays), which led to further understanding of atomic structure.