Question

A substance that cannot be decomposed by a simple chemical process into two or more different substance is ______
(A) molecule
(B) element
(C) mixture
(D) compound

Answer 1

Hint: For this problem, we have to study the concept of elements, molecule, mixture and compound briefly. One which will be the simplest form will not be able to decompose into two or more different substances.

Complete step by step solution:
-In the given question, we have to choose the correct option which cannot be decomposed by a chemical process into the simpler form.
-As we know that when a substance consisting of two or more atoms or elements bonded with each other then we can decompose it.
-But if the substance is already found in the simpler form then it becomes difficult to decompose the substance.
-Molecules are considered as the group of two or more than two atoms which are bonded with each other through a chemical bond.
-So, a molecule can decompose into two or more atoms. For example, the decomposition of water:
$\text{2}{{\text{H}}_{2}}\text{O }\xrightarrow{\text{Hydrolysis}}\text{ 2}{{\text{H}}_{2}}\text{ + }{{\text{O}}_{2}}$
-Mixture consists of many types of molecules which are not attached with the chemical bond due to which each atom can be separated easily by considering the difference in their physical properties
-For example, air which is a mixture of many gases such as nitrogen, oxygen, carbon, etc.
-Whereas compound also consists of two or more than two elements that are chemically bonded to each other.
-So, if we will decompose the compound, it will decompose into elements.
-Now, we can say that the elements are the simplest and purest form which cannot be further decomposed into the simpler substance.
-Each element is different in their own physical and chemical properties.
-Therefore, elements cannot be decomposed into two or more substances.

So, the correct answer is option (B).

Note: Examples of the elements include gold, silver, oxygen, etc. These elements cannot decompose further but can combine with other elements to form a molecule or a compound.