Q 1759401314.     A non-metallic element of group 13, used in making bullet proof vests is
extremely hard solid of black colour. It can exist in many allotropic forrns
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?

NCERT Exemplar 11/49/LAT
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