Question

One of the statements of Dalton’s atomic theory is given below:

“Compounds are formed when atoms of different elements combine in a fixed ratio”

Which of the following laws is not related to this statement?

• A. Law of conservation of mass
• B. Avogadro law
• C. Law of multiple proportions
• D. Law of definite proportions

Answer 1

Answer: (A), (B)

Avogadro law

Law of conservation of mass

It states that mass of reactant and products remain same, as mass is conserved in a chemical reaction. So, it is not related with Dalton’s statement.

Law of definite proportions

This law states that 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, it is related with Dalton’s statement. i.e. Compounds are formed when atoms of different elements combine in a fixed ratio

Law of multiple proportions

The law of multiple proportions states that when two elements join together to form two or more compounds, the ratios of the masses of one element, which joins with the fixed mass of the other elements are the simple whole
numbers.
So, it is related with Dalton’s statement, as it involves formation of different compounds in fixed ratios

Avogadro law

Avogadro's law states equal volumes of all gases at the same temperature and pressure should contain equal number of molecules. So, it is not related with Dalton’s statement.

Hence from the above description it is concluded that the correct answer are options (A) and (D), which doesn’t relate with Dalton’s statement.