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प्रश्न
On the basis of composition of matter, milk is considered to be :
पर्याय
a pure substance
an impure substance
an element
a compound
उत्तर
an impure substance
Milk is considered to be an impure substance as it is an emulsion. Emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid, which is not miscible with it.
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संबंधित प्रश्न
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Name one solid, one liquid and one gaseous non-metal.
What is meant by saying that non-metals are brittle ?
What is meant by saying that metals are sonorous ?
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
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Name the different types of solutions. Give one example of each.
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Describe a method to separate a mixture of common salt and sand.
How will you separate a mixture of common salt, sulphur powder and sand ?
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There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
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Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
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The physical state of water at 373 K is ______.
Evaporation is always accompanied by ______ in temperature.
