JEE Main 2023 — S Block Elements Question with Solution
From: JEE Main 2023 (Online) 31st January Evening Shift
Question
The number of alkali metal(s), from , Rb having ionization enthalpy greater than and forming stable super oxide is _____________.
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Correct answer
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Step-by-step explanation
Li does not form superoxide.
K, Rb and Cs form stable super oxides but Cs has ionisation enthalpy less than 400 kJ. While K and Rb have ionisation enthalpy greater than 400 kJ mol–1.
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This is a previous-year question from JEE Main 2023, 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.