JEE Main 2023 — p Block Elements (Group 13 & 14) Question with Solution
JEE Main 2023 (30 Jan Shift 1)
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:
Choose an option
Show full solutionCorrect option: C
Step-by-step explanation
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.
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This is a previous-year question from JEE Main 2023, covering the p Block Elements (Group 13 & 14) chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.