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

Options

A. `KCl gt CsCl gt NaCl gt LiCl`
B. `LiCl gt KCl gt NaCl gt CsCl`
C. `CsCl gt KCl gt NaCl gt LiCl`
D. `NaCl gt KCl gt LiCl gt CsCl`

Answer

A

Explanation

The stability of the compound depends on `Delta_(f)H^(Θ)` .Evidently,more negative the value of `Delta_f H^(Θ)`, more si the stability.
`Delta_(f)H^(Θ) of KCl = -428 k Jmol^(-1) , Delta_(f)H^(Θ) of CsCl = -424 kJ mol^(-1)`
`DeltafH^(Θ) of NaCl = - 400 K Jmol^(-1), DeltafH^(Θ) of LiCl = -398 k J mol^(-1)`