Question

“Matter is neither created nor destroyed.” Which law is stated?
A. Law of multiple proportion
B. Law of conservation of energy
C. Law of constant composition
D. Law of conservation of mass

Answer 1

Hint: This law was introduced by a scientist named Antoine Lavoisier. Earlier, Greeks explained that in a universe, the total amount of matter is constant. This was the basic ideology which was introduced in 1789.
All of the given laws come under the group of law of chemical combinations.

Complete step by step answer:
Now let’s focus on each option.
A. Law of multiple proportion states that when elements are combined to form compounds, one element having different masses combines with the other element having the same relative mass in a specific ratio of whole numbers. This is not related to matter.
B. When we do work, energy is transferred which is in the same unit as the work. This law states that a new energy cannot be formed or existing energy cannot be lost. It transfers from one form to another. So we can say that the total amount of energy is fixed. This is also not related to matter.
C. A compound having different samples contains the same elements which are combined together in the same mass proportion. This law is termed as the law of constant composition.
D. We know that in a chemical reaction, the amount of reactants will be equal to the amount of products. The amount of both substances is termed with respect to the mass. Thus we can say that the total mass in a chemical reaction is fixed. It will only transfer from one substance to another. This can also be explained in terms of matter.
Thus the law of conservation of mass states that matter is neither created nor destroyed.

So, the correct answer is Option D.

Note: We know that the matter is classified into mixtures and pure substances. Pure substances are further classified into elements and compounds. Elements are pure substances which cannot be separated by physical or chemical methods. While compounds are the combination of elements in a fixed ratio.