Thus, colored cloth, when wet and exposed to 

 Chlorine gas, looses its color by the Chlorine com- 

 bining with the hydrogen of the water and liberating 

 the oxygen, which in turn unites with the coloring 

 matter of the cloth and forms colorless compounds. 

 Oxygen possesses this power only when being liber- 

 ated from a compound; hence this state is called the 

 Nascent state of Oxygen. 



How is Potassium Chlorate prepared? By pass- 

 ing an excess of Chlorine into a warm concentrated 

 solution of Caustic Potash. 



How would you convert Litres into Quarts? Add 

 six per cent. 



How is Sulphureted Hydrogen prepared? By 

 the action of dilute Sulphuric Acid upon Iron Sul- 

 phide. 



What is the best test for Arsenic? By the evolu- 

 tion of Arseniureted Hydrogen, on adding zinc and 

 Sulphuric Acid to the solution to be tested. On 

 burning the gas, Arsenic is deposited in the metallic 

 state upon a piece of cold porcelain held in the flame. 



What are Acrid principles ? Extractive substances, 

 frequently amorphous, of various composition; they 

 are usually neutral principles, sometimes resinous, 

 whose names end in in\ some however, have acid 

 character. 



What officinal liquor is made without water? Liq- 

 uor Gutta-Perchae. 



What is the difference between liquor ferri sub- 

 sulphatis and liquor ferri tersulphatis? The latter 

 contains a larger proportion of Sulphuric Acid. 



What effect has heat upon Gallic acid? When 

 heated at 210 C., it forms pyrogallic acid and car- 

 bon dioxide. 



Aurum. What is the Officinal Salt? Auri e-t 

 Sodii Choridum. 



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