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The smallest unit of a compound is called a molecule.
(A) True
(B) False

Answer
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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- 2H2O2H2+O2
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- N2
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.
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