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प्रश्न
Answer the following question:
Why are copper and aluminium used to make electric wires?
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उत्तर
Copper and aluminium are good conductors of heat and electricity. They can be drawn into wires and beaten into sheets. Therefore, they are used to make electric wires.
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संबंधित प्रश्न
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Name: the Hardest Naturally Occurring Substance
Define: Atom
Define: Formula
Give one use of the following substance:
Coal
Answer the following question:
What do you understand by the statement: ‘metals are ductile and malleable’?
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
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 |
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?
