[Fe(H20)6]3+<[Na(H20)6]+
apply concept that ions having high charge densities are strongly polarizing.
arrange in inc order of acidity:
[Na(H20)6]+
[Sc(H20)6]3+
[Fe(H20)6]3+
[Mn(H20)6]2+
[Ni(H20)6]2+
[Fe(H20)6]3+<[Na(H20)6]+
apply concept that ions having high charge densities are strongly polarizing.