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प्रश्न
Differentiate between the terms –
elements, compounds & mixtures.
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उत्तर
Element is a pure substance.
1. It is the basic unit of matter and cannot be broken down into two or simpler substances by any means.
2. It is mainly classified into metals, non-metals, metalloids, and noble gases.
The compound is a pure substance.
1. It is formed by a combination of two or more elements.
2. The elements are combined together in a fixed ratio.
3. It can be broken down into its elements by chemical means.
The mixture is an impure substance.
1. It is formed by the combination of two or more elements, compounds, or both.
2. The substances are mechanically mixed together in any ratio.
संबंधित प्रश्न
Name the substance you will add to speed up sedimentation.
What is meant by 2H and H2
Answer the following question:
What do you understand by the statement: ‘metals are ductile and malleable’?
Indicate whether the following statement is true or false:
Metals reflect light and are good conductors of electricity
Match the statements in List I – 1 to 10 correct answers in List II-A to J.
| List I | LIst II | ||
| 1 | Fluorine and chlorine | A | Nitrogen |
| 2 | A diatomic molecule | B | Boron |
| 3 | A molecule containing the elements hydrogen and oxygen. | C | Reactants |
| 4 | A metalloid - showing properties of both metals and non-metals. | D | Chemical Formula |
| 5 | The term used for the substances which take part in the chemical reaction | E | Halogens |
| 6 | The term represents a substance by means of symbols. | F | Water |
| 7 | The term used for the substances formed as a result of a chemical reaction | G | Nitric Acid |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | H | Products |
| 9 | The chemical name for nitrogen monoxide. | I | Phosphorus |
| 10 | A polyatomic molecule. | J | Zinc Chloride |
Select the correct answer from the choice given below.
The element which is malleable
Select the correct answer to the statement given below:
A metalloid
Define the terms elements, compounds & mixtures with a view to show their basic difference.
Give a reason for the following statement :
Brass & bronze are examples of mixtures, while copper sulphate & lead nitrate are examples of compounds.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
