Given below are two statements:

Statement I: Boron is extremely hard indicating its high lattice energy.

Statement II: Boron has highest melting and boiling point compared to its other group members

Question

Given below are two statements:

Statement I: Boron is extremely hard indicating its high lattice energy.

Statement II: Boron has highest melting and boiling point compared to its other group members.

In the light of the above statements, choose the most appropriate answer from the options given below:

Canvas Classes · Accepted Answer

Statement I: Boron is one of the hardest elements (hardness ~9.5 on Mohs scale). It forms a covalent network solid with icosahedral  units held by strong covalent bonds, giving it very high lattice energy. ✓

Statement II: Boron has the highest melting point (2453 K) and boiling point (4273 K) in Group 13, far exceeding Al (933 K), Ga (303 K), In (430 K), and Tl (577 K). ✓

Both statements are correct.

Answer: Option (3)

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