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प्रश्न
Explain the term ‘mixture’.
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उत्तर
Mixture: A mixture is made up of two or more substances elements or compounds or both mechanically mixed together in any proportion. A mixture retains the properties of its constituent elements or compounds.
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संबंधित प्रश्न
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Name: an Inert Gas
Give two examples of the following.
Non-metals which are lustrous
Name: A form of carbon used as a gem
Name A substance used as an insulator.
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
Classify the substances given in Fig. 2.2 into elements and compounds
