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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
Choose the most appropriate answer
A solvent of Iodine is
Fill in the blank
A pure substance has definite.................. and constant ..............
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
Define: Compounds
State the number of atoms of CaCO3
Indicate whether the following statement is true or false:
Metals reflect light and are good conductors of electricity
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
Select the correct answer from the choice given below to complete the sentence :
Dust in air is an example of _________ mixture.
Differentiate metals and non-metals.
