JEE Main 2022 — s Block Elements Question with Solution
JEE Main 2022 (26 Jul Shift 2)
Question
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason . Assertion : is sparingly soluble in water. Reason : The ionic radius of ion is smallest among its group members, hence has least hydration enthalpy.
In the light of the above statements, choose the most appropriate answer from the options given below.
Choose an option
Show full solutionCorrect option: C
Step-by-step explanation
The low solubility of in water is due to its high lattice enthalpy.
The hydration enthalpies of alkali metal ions in aqueous solution decreases with increase in ionic sizes.
has maximum degree of hydration and for this reason lithium salts are mostly hydrated, e.g.,
Hence, A is true and R is false.
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This is a previous-year question from JEE Main 2022, covering the s Block Elements 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.