JEE Main Chemistry question
How many of the following orders are correct for the indicated property? (a) LiI>LiBr>LiCl>LiF (covalent character) (b) (solubility in water) (c) (melting point) (d) NaF>NaCl>NaBr>NaI (melting point)
Answer: 4
Solution
By Fajans' rule, covalent character of lithium halides increases with the size (polarisability) of the halide ion, giving (a) LiI>LiBr>LiCl>LiF, which is correct. 's very high lattice energy (strong attraction between small and small ) makes it far less soluble than , so (b) is correct.
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