Question

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III. Select the odd one out giving reason:
1. Burning of wood, rusting of iron, photosynthesis, freezing of water, souring of milk.
2. Melting of ice, magnetisation of iron nail, burning of matchstick, tearing of paper.
3. Eruption of volcanoes, spoilage of food, cyclone, photosynthesis.​

Answer 1

Answer:

1.freezing of water- because only this is a reversible change.

2.magnetise of iron nail-because it can again be changed

3.spoilage of food- exceptional bcse others are natural calamities.

Answer 2

Answer:

1.freezing of water because it is a reversible change

2.burning of matchsticks because it is a irreversible change

3.photosynthesis because because it is done in plants