Chemical changes are __________.

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Temporary, reversible and a new substance is produced.

Always accompanied by an exchange of light.

Permanent, irreversible and a new substance is produced.

Never accompanied by exchange of light and heat energy.

answer is C.

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Detailed Solution

Concept- Nature undergoes a variety of transformations. Physical and chemical alterations are the two categories into which the change has been divided based on its kind. Let's go through each of these modifications individually.
Physical changes in a material are those that result in a change in its physical qualities, such as altering the substance's state. For instance, an ice cube melting into water is an example of a physical change that may be undone by correcting the temperature conditions. Let's now discuss chemical modifications, which are alterations that take place in a material that cause certain qualities to change and lead to the creation of a new product.
Although during a physical change, no new product is created. For instance, in the case of iron rusting, once iron corrodes to rust under the influence of moisture, it cannot be transformed back to iron. As a result, one attempts to stop it. Thus, we learn that chemical changes are inherent to nature and are both irreversible and permanent. In a chemical reaction, a new product is either created through synthesis or breakdown. There are organic and inorganic chemical changes. Ripening of fruit, the transition from a bud to a flower, and many more organic chemical changes may be seen in nature. Explosions, the burning of matchsticks, etc. are examples of inorganic chemical reactions. The interchange of light and heat energy may or may not accompany chemical changes, as shown by the examples above.
Hence, option 3 is correct.

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