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Q.

The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to

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a

Ionic nature of lithium fluoride

b

High lattice enthalpy

c

High hydration enthalpy for lithium ion

d

Low ionisation enthalpy of lithium atom

answer is B.

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Detailed Solution

Lattice energy decreasesAs the size of cation increases and hence the solubility decreases → In case of alkali flourides, as the cation size increases the cation in lattice energy is more observed compared to the hydration energy and hence in the case the solubility depends upon the L.E LiF is least soluble & CsF is highly soluble .
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The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to