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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 exhibits maximum covalence of four. Identify the element and write the reaction of its trifluoride with ammonia. Explain why does the trifluoride acts as a Lewis acid.

Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :In group-13, <a href="https://interviewquestions.tuteehub.com/tag/boron-400820" style="font-weight:bold;" target="_blank" title="Click to know more about BORON">BORON</a> is only non-metallic and extremely hard and <a href="https://interviewquestions.tuteehub.com/tag/also-373387" style="font-weight:bold;" target="_blank" title="Click to know more about ALSO">ALSO</a> used for making bullet proof vests. Boron exists in many allotropic forms. It usually shows high melting point and does not have. d-orbital. <br/> It can show maximum covalence of 4 by using 2s and 2p orbitals. In trivalent halides of boron, octet of boron is not <a href="https://interviewquestions.tuteehub.com/tag/completed-409685" style="font-weight:bold;" target="_blank" title="Click to know more about COMPLETED">COMPLETED</a> hence acts as Lewis <a href="https://interviewquestions.tuteehub.com/tag/acid-847491" style="font-weight:bold;" target="_blank" title="Click to know more about ACID">ACID</a>. It reacts with Lewis base and forms adduct. <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_CHE_XI_P2_C11_E04_077_S01.png" width="80%"/></body></html>


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