| Direction: Q. 1 to 5 |
| Read the following and answer questions from [1] to [5]. |
| Pure substances are classified as elements or compounds. An element is a substance that contains only one type of atom. Also, an element cannot be broken down or transformed into a new substance even by using some physical or chemical methods. |
| A compound is a substance composed of two or more different types of elements, chemically combined in a fixed proportion. |
| The constitutents cannot be separated by simple physical methods. |
| However, these substances can be broken down into separate elements by chemical methods. |
| On the other hand, mixtures are different from pure substances. They are called impure substances. They have different characteristics than elements and compounds. |
| They are composed of different elements or compounds mixed together or more than one pure substance that combined together in any composition. |
| When, mixture forms, there is only a little or no energy change. Mixtures are further classified into homogeneous and heterogeneous mixture. |
A) an element
B) a compound
C) a mixture
D) a solution
Correct Answer: C
Solution :
[c] Wood is a mixture because it contains compounds such as cellulose, lignin which are composed of elements like carbon, hydrogen and oxygen.
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