GENERAL KNOWLEDGE

Detailed explanation-1: -The correct answer is Melting of ice. Among all the given options, Melting of ice involves a physical change. A physical change involves the changes of state from a solid to a liquid or a gas and vice versa. Boiling water, Ice melting into water is an example of this conversion.

Detailed explanation-2: -As an ice cube melts, its shape changes as it acquires the ability to flow. However, its composition does not change. Melting is an example of a physical change.

Detailed explanation-3: -Ice melting is not a chemical reaction because when an ice is melting there is no chemical change happening upon the ice. The water molecules are still the same, they are still water molecules.

Detailed explanation-4: -Research shows that students frequently use the term chemical change to describe changes in physical state. Freezing and boiling are considered to be examples of chemical reactions.

Detailed explanation-5: -Cutting logs of wood into small pieces is a physical change because no new substance is produced or formed. Burning of wood, Ripening of fruit, and Cooking of food are chemical changes because a new substance is formed in them and they are not reversible.