Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning
In the light of the above statements, choose the correct answer from the options given below :

• A. Both (A) and (R) are true and (R) is the correct explanation of (A)
• B. Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A)$
• C. (A) is false but (R) is tirle
• D. (A) is true but (R) is false

Answer 1

The Correct Option is A

1. Understanding the Assertion (A) and Reason (R): The assertion states that in expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags. The reason given is that silica gel adsorbs moisture from the air via adsorption, thus protecting the instrument from water corrosion (rusting) and preventing malfunctioning.
2. Explanation of Silica Gel's Properties: Silica gel is a desiccant, meaning it is used to control humidity and keep things dry. It is a highly porous form of silicon dioxide (SiO₂) that can adsorb moisture from its surroundings. This property is crucial for protecting sensitive instruments from moisture.
3. Analysis of Assertion (A): The assertion is true as silica gel is indeed used in scientific instruments to keep them free from moisture. Moisture can lead to corrosion or malfunctioning of the instruments, and therefore, silica gel is placed in these instruments to ensure longevity and efficiency.
4. Analysis of Reason (R): The reason correctly explains the property of silica gel – its ability to adsorb moisture from the air. This adsorption process is essential for protecting instruments from moisture-related problems like rusting.
5. Conclusion: Since both statements are true and the reason provided is indeed the correct explanation for the assertion, the correct answer is:
   Both (A) and (R) are true and (R) is the correct explanation of (A) .