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प्रश्न
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
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उत्तर
A compound is a pure substance made up of two or more different elements [atoms] combined chemically in a fixed proportion.
Since one carbon atom and two oxygen atoms combine to generate one carbon dioxide molecule (CO2), we refer to the combination of carbon and oxygen as occurring in a fixed ratio of 1 : 2 to form carbon dioxide.
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संबंधित प्रश्न
Give one example for the following types of mixtures :
misicible liquids
Name: an Inert Gas
Give two examples of the following.
Non-metals which are lustrous
Give one use of the following substance:
Brass
Find the atomicity of the Following molecule:
Acetic Acid
Tick (√) the correct alternative from the choice given for the following statement.
Sulphur and carbon are
Who are my companions?
| Group 'A' | Group 'B' |
| 1. Stainless steel | (a) Non-metal |
| 2. Silver | (b) compound |
| 3. Bhajani mixture for milling | (c) Mixture |
| 4. Salt | (d) Element |
| 5. Coal | (e) Alloy |
| 6. Hydrogen | (f) Metal |
Select the correct answer to the statement given below:
A non-metal which exists in the liquid state.
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 |
Reason out
Elements are called semimetals.
