2. Tick the most appropriate answer:
(iii) A pure substance wich cannot be subdivided into two or more simpler substance by any chemical means is called:
2. Tick the most appropriate answer:
(iii) A pure substance wich cannot be subdivided into two or more simpler substance by any chemical means is called:
The correct option is A elements
Explanation for correct option:
(A)
An element is defined as a substance, which cannot be subdivided into two or more simpler substances by any chemical means.
Explanation for incorrect options:
(B)
A molecule is defined as the smallest unit of matter, which has an independent existence and can retain the complete physical and chemical properties of matter.it is made up of one or more atoms that are joined by covalent (chemical) bonds.
(C)
Compound: A pure substance that consists of two or more elements chemically combined in a fixed ratio is called a compound.it can be broken down into simpler substances by chemical methods.
(D)
A mixture consists of two or more substances that are mixed together but not chemically combined. Air and sand are some examples of mixtures.
Hence, the correct answer is option (A).
elements
Explanation for correct option:
(A)
An element is defined as a substance, which cannot be subdivided into two or more simpler substances by any chemical means.
Explanation for incorrect options:
(B)
A molecule is defined as the smallest unit of matter, which has an independent existence and can retain the complete physical and chemical properties of matter.it is made up of one or more atoms that are joined by covalent (chemical) bonds.
(C)
Compound: A pure substance that consists of two or more elements chemically combined in a fixed ratio is called a compound.it can be broken down into simpler substances by chemical methods.
(D)
A mixture consists of two or more substances that are mixed together but not chemically combined. Air and sand are some examples of mixtures.
Hence, the correct answer is option (A).
