JEE Main 2020 — S Block Elements Question with Solution
From: JEE Main 2020 (Online) 9th January Evening Slot
Question
Among the statements (a)-(d) the correct ones
are :
(a) Lithium has the highest hydration enthalpy among the alkali metals.
(b) Lithium chloride is insoluble in pyridine.
(c) Lithium cannot form ethynide upon its reaction with ethyne.
(d) Both lithium and magnesium react slowly with H2O.
(a) Lithium has the highest hydration enthalpy among the alkali metals.
(b) Lithium chloride is insoluble in pyridine.
(c) Lithium cannot form ethynide upon its reaction with ethyne.
(d) Both lithium and magnesium react slowly with H2O.
Choose an option
Show full solutionCorrect option: D
Correct answer
D(a), (c) and (d) only
Step-by-step explanation
Lithium has highest hydration enthalpy among
alkali metals due to its small size.
LiCl is soluble in pyridine because LiCl have more covalent character.
Li does not form ethynide with ethyne.
Both Li and Mg reacts slowly with H2O.
LiCl is soluble in pyridine because LiCl have more covalent character.
Li does not form ethynide with ethyne.
Both Li and Mg reacts slowly with H2O.
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This is a previous-year question from JEE Main 2020, 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.