Statement-I: Al is more electropositive than Tl because \( E^\circ_{\mathrm{Al^{3+}/Al}} \) is negative and \( E^\circ_{\mathrm{Tl^{3+}/Tl}} \) is positive.
Statement-II: For B atom, the sum of the first three ionization energies is very high, thus it forms covalent compounds.