The smallest unit of a compound is
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Answer
Hint: A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.
Complete step by step answer:
We have been asked that the smallest unit of compound is molecule,So, for that,We know that: A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.For example: water- $2{{H}_ {2}} O\to 2{{H}_ {2}} +{{O}_ {2}} $ Also, we know:A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.For example: nitrogen- ${{N}_ {2}} $ From this we can say that,An atom is the smallest particle of an element while the molecule is the smallest particle of a compound.The smallest unit of compound are molecules,So, we can say that the statement that the smallest unit of compound is a molecule is true.Therefore, we can conclude that option (A) is correct.
Note: The main properties of a molecular substance include: low melting points, or a temperature that indicates when a solid substance changes to a liquid; and boiling points, or a temperature that indicates the point at which a liquid changes to a gas, or vapor.
Answer
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Hint- In order to comment whether a given statement is true or false first we have to understand the term compound and molecule. Then we will see whether the given statement is true or false.
Complete answer:
Given statement is: The smallest unit of a compound is called a molecule.Compound: When two or more elements chemically combine in a fixed ratio by mass, the obtained product is known as a compound. Molecule: A molecule is a particle made up of two or more atoms that are chemically bonded together; the number of atomic nuclei making up a molecule is a determinate number.Groups of atoms which are bonded together to represent the "fundamental measures of a chemical compound" that are in a chemical reaction are referred to as molecules. These Compounds have atoms of both elements chemically bonded to each other, that is a molecule is the basic unit of the Compound.Hence an atom is the smallest particle of an element while the molecule is the smallest particle of a compound.So, the correct answer is option A.Note- When the elements combine, some of the individual property of the elements is lost and the newly formed compound has new properties. However many compounds do not follow such as NaCl and other ion based compounds, they have pairs of Na and Cl which can be called as the basic unit in the salt rather than "individual molecules of NaCl".