(a) Explain the following :

(i)NF3 is an exothermic compound whereas NCl3 is not.

(ii) F2 is most reactive of all the four common halogens.

(b) Complete the following chemical equations :

(i) C+H2SO4conc

(ii) P4+NaOH+H2O

(iii) Cl2+F2excess 

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