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  4. Hardest compound of boron is

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Q. Hardest compound of boron is

AIIMSAIIMS 2001The p-Block Elements

Solution:

Boron carbide is written as $B _{4} C$. It is produced by reducing $B _{2} O _{3}$ with $C$ at $1600^{\circ} C$. Fibres of $B_{4}$ C have an enormous tensile strength and are used to make bullet- proof clothing.