Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II:…
p-Block Elements (Class 11) · Class 11 · JEE Main Previous Year 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:
- a
Both Statement I and Statement II are incorrect
- b
Statement I is correct but Statement II is incorrect
- c✓
Both Statement I and Statement II are correct
- d
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
Strategy: Verify both statements about Boron's hardness (lattice energy) and its melting/boiling points in Group 13.
Step 1: Statement I — Hardness and Lattice Energy Boron is an extremely hard solid (hardness ~9.5 on Mohs scale) because it forms a covalent 3D network solid with icosahedral clusters linked by strong covalent bonds. High hardness implies high lattice energy. ✅ Statement I is correct.
Step 2: Statement II — Highest MP/BP in Group 13 | Element | MP (K) | |---------|--------| | B | 2453 | | Al | 933 | | Ga | 303 | | In | 430 | | Tl | 577 |
Boron has by far the highest melting and boiling point in Group 13. ✅ Statement II is correct.
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