Physical change vs chemical change

In order to answer the given question, it is important to understand the difference between physical change and chemical change.

A physical change is a change in the physical properties of a substance, such as size, shape, color, texture, or state of matter, without changing its chemical composition. For example, melting of ice, boiling of water, and dissolving of salt in water are all examples of physical changes.

On the other hand, a chemical change is a change in the chemical composition of a substance, resulting in the formation of new substances with different properties. Chemical changes usually involve the breaking and forming of chemical bonds. Examples of chemical changes include burning of wood, rusting of iron, and cooking of food.

Answer

The correct answer to the given question is d) burning of wood.

Explanation

Burning of wood is a chemical change because it involves the breaking and forming of chemical bonds in the wood, resulting in the formation of new substances, such as ash, smoke, and gases like carbon dioxide and water vapor. The composition of wood changes during burning, and it cannot be reversed by physical means. Therefore, burning of wood is not a physical change.

The other options, such as formation of curd from milk, ripening of fruits, and getting salt from sea water, are all examples of physical changes because they do not involve any chemical reactions or changes in the chemical composition of the substances. They only involve changes in the physical properties of the substances, such as formation of a solid from a liquid, softening of a fruit, and separation of salt from water by evaporation.

Conclusion

In summary, physical changes and chemical changes are different types of changes that can occur in substances. Burning of wood is an example of a chemical change, while formation of curd from milk, ripening of fruits, and getting salt from sea water are all examples of physical changes.

Getting salt from sea is physical change bcz it can be reversed...nd no formation of new substance..