( $L i F, B e F_{2}, N a_{3} P O_{4}, K_{3} P O_{4}, B a F_{2}, M g F_{2}, L i_{3} P O_{4}, N a F, C s F, C a F_{2}, M g_{3} (P O_{4})_{2}$ )

Among the following compounds, a number of compounds that is NOT completely soluble in water is:

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Solution

Answer:
$L i F$ is water insoluble as: The lattice energy of $L i F$ is very high due to small size of $L i^{+}$ ions and $F^{-}$ ions. The hydration energy of $L i F$ is lower than lattice energy.
$B e F_{2}$ is soluble in water due to evolution of large hydration energy, when it is dissolved in water.
$N a_{3} P O_{4}$ is insoluble in water as most phosphate compounds are insoluble in water
$K_{3} P O_{4}$ water soluble
$B a F_{2}$ Water soluble
$M g F_{2}$ Insoluble
$L i_{3} P O_{4}$ Slightly soluble in water
$N a F$ - readily soluble in water
$C s F$ -Soluble in water
$C a F_{2}$ is not soluble in water due to extremely high lattice energy
$M g_{3} (P O_{4})_{2}$ Insoluble
Hence $L i F,$ , $N a_{3} P O_{4}$ , $M g F_{2}$ , $C a F_{2}$ , $M g_{3} (P O_{4})_{2}$ are water insoluble compounds

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