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Boron has an extremely high melting point because of
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a
Allotropy
b
Its ionic crystal structure
c
Strong van der Waals forces between its atoms
d
Strong binding forces in the covalent polymer.
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Correct option is D
Boron has a high melting point of 2352 K because of its small atomic size, it forms strong covalent bonds with the adjacent atoms. Thus boron atoms have a close packed structure in its solid state therefore a large amount of heat is required to break the bonds between Boron atoms.
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