Which of these is an example of a physical change? a banana ripening in the air hydrogen burning in the air zinc reacting with an acid liquid water turning into vapor

The correct answer is liquid water turning into vapor.

Explanation:

A physical change is defined as a change in which a change in shape, size etc. takes place. No new substance gets formed in these reactions.

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

For the given options:

When a banana is kept in open air, it leads to the darkening of the surface of banana. This is a result of its oxidation.

Therefore, it is a chemical change.

When hydrogen gas is burned in air, it leads to the formation of water molecule. The equation follows:

Therefore, it is a chemical change.

When zinc is reacting with acid, it leads to the formation of a salt and hydrogen gas. The equation follows:

Therefore, it is a chemical change.

When liquid water is heated, the molecules gets apart and escape in the air in the form of vapor. The equation follows:

Therefore, it is a physical change.

Hence, the correct answer is liquid water turning into vapor.