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प्रश्न
Match the following.
| 1. | Element | Made up of molecules |
| 2. | Compound | Impure substance |
| 3. | Colloid | Settles down on standing |
| 4. | Suspension | Pure substance |
| 5. | Mixture | Made up of atoms |
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उत्तर
| 1. | Element | Pure substance |
| 2. | Compound | Made up of atoms |
| 3. | Colloid | Made up of molecules |
| 4. | Suspension | Settles down on standing |
| 5. | Mixture | Impure substance |
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संबंधित प्रश्न
Give Two Examples for Each of the Following: Non-metals
Give reason: Argon is filled in electric bulbs.
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Fill in the blank
A metal which is a liquid at room temperature is _______.
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Tick (√) the correct alternative from the choice given for the following statement.
The compound used as common salt is
Match the statements in List I – 1 to 10 correct answers in List II-A to J.
| List I | LIst II | ||
| 1 | Fluorine and chlorine | A | Nitrogen |
| 2 | A diatomic molecule | B | Boron |
| 3 | A molecule containing the elements hydrogen and oxygen. | C | Reactants |
| 4 | A metalloid - showing properties of both metals and non-metals. | D | Chemical Formula |
| 5 | The term used for the substances which take part in the chemical reaction | E | Halogens |
| 6 | The term represents a substance by means of symbols. | F | Water |
| 7 | The term used for the substances formed as a result of a chemical reaction | G | Nitric Acid |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | H | Products |
| 9 | The chemical name for nitrogen monoxide. | I | Phosphorus |
| 10 | A polyatomic molecule. | J | Zinc Chloride |
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
