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Chemistry
The solubility order for alkali metal fluoride in water is:
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Q. The solubility order for alkali metal fluoride in water is:
JEE Main
JEE Main 2013
The s-Block Elements
A
$LiF < RbF < KF < NaF$
7%
B
$RbF < KF < NaF < LiF$
11%
C
$LiF > NaF > KF > RbF$
16%
D
$LiF < NaF < KF < RbF$
66%
Solution:
Higher the lattice enthalpy lower will be solubilityi.e.,
lattice enthalpy $\propto=\frac{1}{Solubility}$
Since the lattice enthalpy of alkali metals follow the order
$Li > Na > K > Rb$
Hence the correct order of solubility is
$LiF < NaF < KF < RbF$