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प्रश्न
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
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उत्तर
BURNING OF MAGNESIUM RIBBON is chemical change as It is
- Irreversible change
- New product with new properties is formed (MgO)
- It is a permanent change
- Composition is changed
- Energy is required to bring the change.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
State the various conditions that favour the process of evaporation.
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
True or false
Dissolving of a solid in liquid is a physical change.
Give two examples of periodic changes.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Mention some of the different conditions needed for chemical changes to occur.
