Surface Chemistry Question 5
Question 5 - 30 January - Shift 1
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 :
(1) (A) is false but (R) is true
(2) (A) is true but $(R)$ is false
(3) Both (A) and (R) are true and (R) is the correct explanation of $(A)$
(4) Both (A) and (R) are true but (R) is not the correct explanation of $(A)$
Show Answer
Answer: (3)
Solution:
Silica gel prevents water corrosion (rusting) and instrument malfunction by adsorbing moisture from the air.
