JEE Main202330 Jan 2023Morning ShiftChemistryp Block Elements (Group 13 & 14)Actual
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 state
Options
- A(A) is false but (R) is true
- B(A) is true but (R) is false
- CBoth (A) and (R) are true and (R) is the correct explanation of (A)
- DBoth (A) and (R) are true but (R) is not the correct explanation of (A)
Correct answer
C. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
The moist air becomes dry in presence of silica gel because the water molecules present in air get adsorbed on the surface of the gel. Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and/or prevents malfunctioning. So, both assertion and reason are true and reason is the correct explanation of assertion.