Question

Which of the following is not a characteristic of chemical change?

• A. It is a permanent change.
• B. Exchange of energy take place.
• C. No new substance form.
• D. The change is irreversible.

Answer 1

The correct option is C

No new substance form.

Chemical Changes: A change that alters the specific properties of a material by bringing about a change in its molecular composition, followed by a change in state, is called a chemical change.

• A chemical change results in the formation of one or more new products.
• The weight of the substance undergoing chemical change usually changes.
• The chemical change is permanent and irreversible.
• During a chemical change, energy is either absorbed or given out.

Explanation of correct option

• Option (C). "No new substance forms in chemical change" is not a characteristic of chemical change.

Explanation of Incorrect option

• Option (A). Permanent change,
• Option (B). Exchange of energy, and
• Option (C) irreversible
• All the above are the characteristic of chemical change.

Hence, Option (C) is correct.