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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:
Haemoglobin
Name the main metal present in the following:
Chalk
Give four examples of non-metallic elements.
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
A pure substance has definite _______ and constant _________.
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 |
What is centrifugation ? Also write the principle on which it works.
Differentiate between the terms elements, compounds, and mixtures with suitable examples.
Write the differences between elements and compounds and give an example for each.
Write the differences between mixture and compounds.
