Q. Assertion : is covalent in gaseous and liquid states but ionic in solid state.
Reason : in solid state consists of tetrahedral cation and octahedral anion.

 2194  227 AIIMSAIIMS 2010The p-Block Elements - Part2 Report Error

Solution:

is trigonal bipyramidal containing hybridized atom in liquid and gaseous states whereas in solid state it consists of tetrahedral cation and octahedral anion.