14. c) Name three military explosives and state from what substances each is 



made. 



b) To what element does each of these owe its explosive character ? 



c) State briefly how two of the following substances are made: (1) Celluloid; 



(2) mercerized cotton; (3) collodion; (4) artificial silk. 



15. a) Given unlabeled bottles which severally contain hydrochloric acid, nitric 



acid, and sulphurig acid, how would you identify each, using a chemical 

 test in each case ? 



b) Give one test by which you would determine in each case whether the 

 acid is dilute or concentrated. 



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