TS EAMCET 6-Aug-2021 Shift 2 Question Paper

Li+has high hydration enthalpy but it has high lattice enthalpy in LiF. The lattice enthalpy is higher than hydration enthalpy resulting into low solubility. LiCl is covalent due to small size of cation and large size of anion.
So, it is non-polar and due to better solute-solvent interaction, LiCl is soluble in pyridine. In alkali metal halides, the melting point decreases with increase in covalent character which increases with the size of anion in ionic compound.
So, the order of melting point is
MF>MCl>MBr>MI
Hence, the correct statements are I, III and IV.