AP EAMCET Engineering 2018 Apr 23 Shift 1 Paper

Which of the following statements are correct?
I) P4 molecule is very reactive because of angular strain
II) The basicity of H3PO3 is 3
III) In gas phase, all P-Cl bonds of PCl5 have same bond length
IV) In solid state , PCl5 exists as an ionic solid, in which anion [PCl6]− has octahedral and cation [PCl4]+ has tetrahedral shape.