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प्रश्न
Differentiate between the terms elements, compounds, and mixtures with suitable examples.
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उत्तर
Element – Element is a pure substance
e.g. Potassium
- 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 and non-metals.
Compound – Compound is a pure substance
e.g. Potassium chloride
- It is formed by a combination of two or more elements.
- The elements are combined together in a fixed ratio.
Mixture – Mixture is an impure substance
e.g. Potassium chloride solution
- It is formed by a combination of two or more pure substances.
- The pure substances are mixed together in any ratio.
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संबंधित प्रश्न
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Sedimentation and decantation
Fill in the blank
_______ are made up of same kind of atoms.
Give one word answer
The process of transferring the clean liquid after the solid settles at the bottom of the container
Fill in the blank
Use of a __________ to separate the components of a mixture of solids is based on the difference in the size of the components.
Match the columns.
| Column A | Column B |
| 1. To separate grain from chaff | a. filtration |
| 2. To seperat sawdust from water | b. sedimentation and decantation |
| 3. To separate iodine from sodium chloried | c. winnowing |
| 4. To separate iron fillings from sand | d. sublimation |
| 5.It is used to separate sand and water | e.magnetic separation |
| f. handpiicking |
Why is filtration a better technique than sedimentation and decantation ?
What is centrifugation ? Also write the principle on which it works.
Loading is basically speeding up _____.
Write the differences between elements and compounds and give an example for each.
When two or more elements combine together they form ______.
