Single Choice

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

A$$LiCl > KCl > NaCl > CsCl$$
B$$CsCl > KCl > NaCl > LiCl$$
C$$NaCl > KCl > LiCl > CsCl$$
D$$KCl > CsCl > NaCl > LiCl$$
Correct Answer

Solution

Standard enthalpies of formation of alkali metal chlorides, are

$$\Delta H^o_f (LiCl) = -408.8 kJmol^{-1}$$
$$\Delta H^o_f (NaCl) = -411.15.8 kJmol^{-1}$$
$$\Delta H^o_f (CsCl) = -433 kJmol^{-1}$$
$$\Delta H^o_f (KCl) = -436 kJmol^{-1}$$

More the magnitude of enthalpy of formation (heat evolved when one mole of the compound is formed from the elements) more the stability of the compound. Therefore order of stabilities is $$KCl > CsCl > NaCl > LiCl$$

SIMILAR QUESTIONS

s - block Elements (Alkali and Alkaline Earth Metals)

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