JEE Main 2021 — S Block Elements Question with Solution
From: JEE Main 2021 (Online) 27th August Evening Shift
Question
Choose the correct statement from the following :
Choose an option
Show full solutionCorrect option: C
Correct answer
CAmong the alkali metal halides, LiF is least soluble in water.
Step-by-step explanation
a. Standard enthalpy of formation for alkali metal bromides becomes more negative on descending down the group.
b. In case of CsI, lattice energy is less, but Cs+ is having less hydration enthalpy due to which it is less soluble in water.
c. For alkali metal fluorides, the solubility in water increases from lithium to caesium. LiF is least soluble in water.
d. Standard enthalpy of formation for LiF is most negative among alkali metal fluorides.
b. In case of CsI, lattice energy is less, but Cs+ is having less hydration enthalpy due to which it is less soluble in water.
c. For alkali metal fluorides, the solubility in water increases from lithium to caesium. LiF is least soluble in water.
d. Standard enthalpy of formation for LiF is most negative among alkali metal fluorides.
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This is a previous-year question from JEE Main 2021, 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.