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प्रश्न
Define a pure substance. How many types of pure substances do you know?
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उत्तर
Pure substances: “A substance of a definite composition which has consistent properties throughout, is called a pure substance” Types of pure substances: Pure substances are of two types
(i) Elements
(ii) Compounds
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संबंधित प्रश्न
Classify the following substances into compounds and mixtures:
Give one example for the following types of mixtures :
misicible liquids
Fill in the blank
A metal which is a poor conductor of electricity is _______.
Indicate whether the following statement is true or false:
Metals can be polished.
Select the correct answer from the choice given below.
A group of atoms of elements
Write the names of elements from the following symbol:
Xe
Write the names of elements from the following symbol:
Br
Write the names of elements from the following symbol:
Ir
Write the names of elements from the following symbol:
Pt
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
