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Question

Boron forms covalent compounds due to :

A
higher ionisation enthalpy
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B
lower ionisation enthalpy
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C
small size
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D
large size
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Solution

The correct option is C small size
As boron is predominantly a non-metal it hardly loses the electrons and forms ionic bonds. It always forms covalent bonds due to following reasons:
1) Small size
2) High ionisation energy
Hence option (a), (c) is correct.

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