JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The stability of the following alkali metal chlorides follows the order:

(A)LiCl>KCl>NaCl>CsCl
(B)CsCl>KCl>NaCl>LiClCorrect
(C)NaCl>KCl>LiCl>CsCl
(D)KCl>CsCl>NaCl>LiCl

Answer: (B)

Solution

Stability of an ionic solid tracks the magnitude of its (negative) heat of formation — the more negative (exothermic) the formation enthalpy, the more stable the compound. The approximate heats of formation for LiCl, NaCl, KCl and CsCl are

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Question ID VK-137801