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प्रश्न
Define the terms elements, compounds & mixtures with a view to show their basic difference.
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उत्तर
Element is a pure substance.
- It is the basic unit of matter and cannot be broken down into two or simpler substances by any means.
- It is mainly classified into metals, non-metals, metalloids, and noble gases.
The compound is a pure substance.
- It is formed by a combination of two or more elements.
- The elements are combined together in a fixed ratio.
- It can be broken down into its elements by chemical means.
The mixture is an impure substance.
- It is formed by a combination of two or more elements, compounds, or both.
- The substances are mechanically mixed together in any ratio.
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संबंधित प्रश्न
Define: Elements
Give Two Examples for Each of the Following: Metalloids
Match the Columns:
| Column A | Column B | ||
| (a) | Metals | (i) | Non-Reactive |
| (b) | Molecules | (ii) | Brittle |
| (c) | Non-Metals | (iii) | Lustrous |
| (d) | Noble Gases | (iv) | Smallest unit of Compound |
Tick (√) the correct alternative from the choice given for the following statement.
The most abundant elements in the universe are
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
Select the correct answer to the statement given below:
The chemical name for dinitrogen oxide [N20].
Give an example of two liquids which form homogenous.
Assertion: Air is a mixture of elements only.
Reason: Only nitrogen, oxygen and neon gases exist in air.
Name the process associated with the following
A fine beam of light entering through a small hole in a dark room illuminates the particles in its paths.
