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A non- metallicelement of group 13, used in making bullet proof vests is extremely hardsolid of black colour. It canexist in many allotropic forms and has unusally high melting point. Its frifluride acts as Lewis acid towards ammonia. The element exhibits maximum covalency of four. Identify the element and write the reaction of itstrifluoride with ammonia. Explain why does the trifloride act as a Lewis acid.

Answer» <html><body><p></p>Solution :The only non-metallic element of group13 is boron. It is an extremely hardblacksubtanceand is usediin making bullet proofvests. It existsin many allotropic <a href="https://interviewquestions.tuteehub.com/tag/forms-11384" style="font-weight:bold;" target="_blank" title="Click to know more about FORMS">FORMS</a> and has <a href="https://interviewquestions.tuteehub.com/tag/usually-722248" style="font-weight:bold;" target="_blank" title="Click to know more about USUALLY">USUALLY</a> high <a href="https://interviewquestions.tuteehub.com/tag/meltingpoint-2826063" style="font-weight:bold;" target="_blank" title="Click to know more about MELTINGPOINT">MELTINGPOINT</a>. Since B has only s- andp-orbitals but no d-orbitalstherefore at the maximum it can exhibit a covalency of four. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PR_CHE_02_XI_C11A_E12_009_S01.png" width="80%"/> <br/> Since B in `BF_(3)` has only six electrons in its <a href="https://interviewquestions.tuteehub.com/tag/valence-1442169" style="font-weight:bold;" target="_blank" title="Click to know more about VALENCE">VALENCE</a> shell, therefore, it needs two more electrons to completeits octet. Thus, `BF_(3)`acts as a <a href="https://interviewquestions.tuteehub.com/tag/lewis-541347" style="font-weight:bold;" target="_blank" title="Click to know more about LEWIS">LEWIS</a> acid.</body></html>


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