Which of the following tells correctly about chemical changes?

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Temporary, reversible, and a new substance is produced

Always accompanied by the exchange of light

Permanent, irreversible, and a new substance is produced

Never accompanied by the exchange of light and heat energy

answer is C.

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Detailed Solution

Chemical changes are permanent, irreversible and during a chemical change, a new substance is produced.
A chemical change is the transformation of one substance into another, the formation of new compounds with distinct properties or any combination of these. Molecular changes in chemical composition occur. Material is created through a chemical reaction. It is an irreversible change. Combustion (burning), the cooking of an egg, and the rusting of an iron pan are a few examples of chemical changes.

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