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Question

The compounds of Boron are :

A
Mostly ionic
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B
Mostly covalent
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C
Crystalline
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D
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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