(a) Complete the following chemical equations :

(i) ${P}_{4}+NaOH+{H}_{2}O\to$

(ii) $Xe{F}_{4}+{O}_{2}{F}_{2}\to$

(b) How would you account for the following situations ?

(i) The acidic strength of these compounds increases in the following order:

$P{H}_{3}>{H}_{2}S>HCl$

(ii) The oxidising power of oxoacids of chlorine follows the order :

$HCI{O}_{4}>HCI{O}_{3}>HCI{O}_{2}>HCIO$

(iii) In vapour state sulphur exhibits paramagnetic behaviour.