(a) Complete the following chemical equations :

(i) P4+NaOH+H2O

(ii) XeF4+O2F2

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

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

     PH3>H2S>HCl

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

     HCIO4>HCIO3>HCIO2>HCIO

(iii) In vapour state sulphur exhibits paramagnetic behaviour.

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