Question

A nonmetallic element of group 13, used in making bullet proof vests is extremely hard solid of black colour. It can exist in many allotropic forms and has unusually high melting point. Its trifluoride acts as Lewis acid towards ammonia. The element exihibits maximum covalency of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why does the trifluoride act as a Lewis acid.

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Answer 1

The only non-metallic element of group 13 is boron. It is an extremely hard black substance and is used in making bulletproof vests. It exists in many allotropic forms and has usually high melting point. Since, B has only s and p-orbitals but no d-orbitals, therefore, at the maximum it can exhibit a covalency of four.

Explanation:

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Answer 2

Answer:

★Given

• A non-metallic element of group 13. Trifloride of this element act as a lewis acid.

★Solution

• The only non-metallic element of group 13. is boron. it is an extremely substance and is used in making bullet proof Vests it exists in many allotropic forms. and has usually high melting point. Since Boron has only s and / orbitals but no d-orbitals. Therefore at the maximum it can exhibit a covalency of four.

• Since B in Bf3 has only six electrons in its valence shell, therefore, it needs two more electrons to complete its Octet Thus, Bf3 acts as a lewis acid.

• $★NH_{3} + BF_{3} → H_{3} N + BF _{3}$
• Here BF3 is a Lewis acid, as it is an electron par acceptor.

★Note :There was a mistake in the last Answer in the equation , Apologises for it.

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