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प्रश्न
Fill in the blank:
________ and _______ are pure substances.
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उत्तर
Elements and compounds are pure substances.
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संबंधित प्रश्न
Name the main metal present in the following:
Chlorophyll
Name the main metal present in the following:
Chocolate wrappers
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
Filtration
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:
_________ is a process to obtain a very pure form of a solid dissolved in a liquid.
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.
Fill in the blank.
_________ is used when the constituents of a mixture of solids have a difference in their weights.
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 |
Write the differences between elements and compounds and give an example for each.
When two or more elements combine together they form ______.
