Question

PCl5 easily breaks into PCl3 and Cl2

Answer 1

Pcl5 has a trigonal pyramidal shape. The bond pair – bond pair repulsion is greater in the two axial P-Cl bonds as compared to the three equatorial P-Cl bonds. 

So the axial P-Cl bonds are less stable and are removed readily when PCl5 is heated. 
PCl5 = PCl3 +Cl2

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