The questions below consist of Assertion (A) and Reason (R). Use the following key to select the correct answer:
(a) If both assertion and reason are correct and the reason is the correct explanation for the assertion.
(b) If both assertion and reason are correct but the reason is not the correct explanation for the assertion.
(c) If the assertion is correct but the reason is incorrect.
(d) If the assertion is incorrect but the reason is correct.
Assertion: A chemical change cannot be easily reversed.
Reason: A new chemical substance is formed as a result of chemical change.

(a)

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(b)

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(c)

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(d)

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Solution

The correct option is A
(a)

Explanation for correct option(a):
A chemical change occurs when the molecular composition is totally transformed and a new product is created.
A new product is created as a result of chemical changes. Chemical changes are irreversible and permanent.
The given assertion that a chemical change cannot be easily reversed is correct. The given reason that a new chemical substance is formed as a result of chemical change is also correct and it is the correct explanation of the given assertion.

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