Given below are two statements: Statement I: Aluminium is more...

Statement I: The standard reduction potential $E^{\circ}_{\text{Al}^{3+}/\text{Al}}$ is $-1.66$ V, which is highly negative, indicating that aluminium has a strong tendency to lose electrons and is highly electropositive. The standard reduction potential $E^{\circ}_{\text{Tl}^{3+}/\text{Tl}}$ is $+1.26$ V, which is positive, indicating that thallium is less electropositive than aluminium. Thus, Statement I is true.

Statement II: Boron has a very small atomic size, resulting in a very high sum of its first three ionization enthalpies. This high energy requirement prevents boron from losing three electrons to form $\text{B}^{3+}$ ions, so it forms only covalent compounds. In contrast, aluminium has a larger size and a significantly lower sum of its first three ionization enthalpies, allowing it to easily form $\text{Al}^{3+}$ ions in its compounds. Thus, Statement II is true.

Both Statement I and Statement II are true.

Answer: Both Statement I and Statement II are true