The compounds of Boron are :

Mostly ionic

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Mostly covalent

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Crystalline

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Both (A) and (B)

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Solution

The correct option is B Mostly covalent
Due to small size of B, the sum of its first three ionization enthalpies is very high.
This prevents it from forming +3 ions and compels it to form only covalent compounds.

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Similar questions

Which of the following compounds of boron does not exist in the free form?

s p^{2}

s p^{3}

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