Arrange the following based on solubility in water:
CsF(I), KF(II), NaF(III), LiF(IV)
I>II>III>IV
III>I>II>IV
IV> III>II>I
IV>II> III>I
Because of the small size of F- the lattice energy decreases as we move down the group and the hydration energy does not vary much. So, the Lattice energy becomes more than the hydration energy and makes the solid more soluble.
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