Which of the following are physical changes and which are chemical changes?
- Burning of a magnesium wire.
- Freezing of water.
- Rusting of iron.
- Glowing of an electric bulb.
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- Burning of magnesium wire: Chemical change.
- Freezing of water: Physical change.
- Rusting of iron: Chemical change.
- Glowing of electric bulb: Physical change.
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