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प्रश्न
Name the main metal present in the following:
Chalk
उत्तर
Chalk - Calcium
APPEARS IN
संबंधित प्रश्न
State four difference between compounds and mixtures.
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
By using a separating funnel
Fill in the blank
_______ are made up of same kind of atoms.
Fill in the blank.
_________ is used when the constituents of a mixture of solids have a difference in their weights.
Write true or false
All pure substances have characteristic melting and boiling points.
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 |
How can you separate iron metal from non-magnetic impurities ?
Why is filtration a better technique than sedimentation and decantation ?
What is centrifugation ? Also write the principle on which it works.
Write the differences between elements and compounds and give an example for each.
