(a) Complete the following chemical equations :

(i) NaOH (aq) Hot and conc.+Cl2g 

(ii) XeF6s+H2Ol 

(b) How would you account for the following ?

(i) The value of electron gain enthalpy with negative sign for sulphur is higher than that for oxygen.

(ii) NF3 is an exothermic compound but NCl3 is endothermic compound.

(iii) CIF3 molecule has a T-shaped structure and not a trigonal planar one.                        5 mark

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