Give reasons :
(i) `PCl_(5)` is more volatile than `PCl_(3)`.
(ii) O-O bond has lower bond dissociation enthalpy than S-S bond.
(iii) `F_(2)` is stronger oxidising than `Cl_(2)`.

Explanation

(i) In `PCl_(5)` molecule, P atom is present in higher oxidation state `(+5)` than in `PCl_(3)` molecule in which P atom is in `(+3)` oxidation state. Therefore, `PCl_(5)` is more easily hydrolysed in coming into contact with water and is also more volatile than `PCl_(3)`.
(ii) Due to smaller bond length of `( : overset(* *)O=overset(* *)O: )` the interelectronic repulsion is more than in ` : underset(* *) overset(* *)S-underset( * *)overset(* *)S : ` bond in which bond length is comparatively more.
(iii) Since `E^(@)` value of `F_(2)(2.87 V)` is more than that of `Cl_(2) (E^(@)=1.36 V)`, it can act as a stronger oxidising agent than `Cl_(2)`.