JEE Main 2015 — S Block Elements Question with Solution
From: JEE Main 2015 (Offline)
Question
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice
enthalpy?
Choose an option
Show full solutionCorrect option: A
Correct answer
ABeSO4
Step-by-step explanation
In alkaline earth metals, ionic size increases down the group. The lattice energy remains constant because sulphate ion is so large, so that small change in cationic size does not make any difference. On moving down the group the degree of hydration of metal ions decreases very much leading to decrease in solubility.
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This is a previous-year question from JEE Main 2015, 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.