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प्रश्न
Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to existence
उत्तर
Existence
Elements –Elements i.e. atoms are present on their own. e.g. Iron and sulphur exist on their own as elements iron and sulphur.
Compounds – Components in a compound present in a definite proportion. e.g. Iron and sulphur are chemically combined in a fixed ratio in iron sulphide
Mixtures –Components in a mixture present in any proportion. e.g. Iron and sulphur are mixed in any ratio in the mixture of iron and sulphur.
संबंधित प्रश्न
What is the difference between a pure substance and a mixture ?
Define Compounds
Name the elements present in Sugar
What is the proportion of element present in the following compound?
CO2
State three differences between water and air.
State the information obtained from the formula of a compound.
Write the molecular formulae of compound lead sulphide.
Give the example of a compound containing carbon and oxygen.
State two characteristics of water which prove that it is a – compound.
What is the molecular formula of the following compound?
Sodium chloride
State true of false. If false, give the correct statement.
Compounds and elements are pure substances.
Explain the characteristics of compounds
Assertion: Air is a compound.
Reason: Air consists of carbon dioxide.
Mention any four compounds and their uses.
Mention the uses of the following compounds.
- Baking soda
- Bleaching powder
- Quick lime
State whether true or false. If false, correct the statement.
A compound cannot be broken into simpler substances chemically.
Complete the table
| Compound | Constituent elements |
| Sodium carbonate | Sodium, Carbon. Oxygen |
| Water | |
| Calcium oxide | |
| Sugar | Carbon, Hydrogen, Oxygen |
When does the pressure of the gas increase?
