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

Options

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

Answer

D

Explanation

Stability of a compound depends upon its enthaolpy of formation `DeltaH_(f).` The more negative value of `DeltaH_(f)` show more stable of a compound. Thus KCl is more stable and LiCl is least stable.
`DeltaH_(f) ` for `LiCl=-408.8 kJ mol ^(-1)`
`Delta H_(f) ` for `NaCl=-412.5kJ mol ^(-1)`
`Delta H_(f)` for `CsCl =-433 kJ mol ^(-1)`
`Delta H_(f)` for `KCl =-436 kJ mol ^(-1)`