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

LiCl > KCl > NaCl > CsCl

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CsCl > KCl > NaCl > LiCl

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NaCl > KCl > LiCl > CsCl

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KCl > CsCl > NaCl > LiCl

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Solution

The correct option is D
KCl > CsCl > NaCl > LiCl

More the –ve value of heat of formation, greater is the stability of the compound due to lower magnitude of potential energy.

$Δ$ $H_{f}$ = -97.7. -98.6, -103.5, -104.2 Kcal for LiCl, NaCl, CsCl, KCl

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The correct order of electric conductance at infinite dilution of LiCl, NaCl and KCl is

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L i C l

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