(a) Complete the following chemical equations :

(i)

(ii)

(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) $N{F}_{3}$ is an exothermic compound but $NC{l}_{3}$ is endothermic compound.

(iii) $CI{F}_{3}$ molecule has a T-shaped structure and not a trigonal planar one.                        5 mark

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