The correct option is A T T T
S1 : According to Fajan's rule, polarizability of I− in AgI is higher than that of F− in AgF. Hence AgI is less soluble than AgF, due to its high covalent nature.
S2 : Ba2+ ion has low charge density due to its larger size when compared to Be2+ ion. Hence it has a low polarizing power when compared to Be2+. So, according to Fajan's rule, BaCl2 has a higher ionic character and thus has a higher melting point.
S3 : Higher the charge density, larger will be the hydrated radii.
Order of charge density : Al3+>Mg2+>Na+
Hence, the order of hydrated radii will follow the same order i.e. Al3+(aq)>Mg2+(aq)>Na+(aq)
Thus, all the three statements are correct.