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प्रश्न
Fill in the blank
A pure substance has definite _______ and constant _________.
उत्तर
A pure substance has definite composition and constant properties.
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संबंधित प्रश्न
Name the main metal present in the following:
Chalk
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.
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 |
Differentiate between the following.
solution and suspension
Name the substance you will add to speed up sedimentation.
Why is filtration a better technique than sedimentation and decantation ?
Loading is basically speeding up _____.
Differentiate between the terms elements, compounds, and mixtures with suitable examples.
