1 24 CHE MIS TR V FOR A GRIC UL TURAL S TU DENTS 



Chlorine. 



94. By what general method can hydrochloric acid be made to give up 



its chlorine ? Fully explain the action of, for example, red lead 

 upon it. 



95. Give an account of the preparation of chlorine gas, and represent the 



reaction by which it is formed by an equation. 



96. What are the properties of chlorine in respect to colour, smell and 



taste, density, solubility, and combustibility ? Is it a supporter of 

 combustion to all the elements which burn in air, or only to some 

 of them? Explain the peculiar flame observed when a lighted 

 taper is thrust into chlorine gas. 



97. Describe fully the action of sunlight upon chlorine water. Is light a 



force which, like heat, can overcome chemical attraction ? 



98. Explain why chlorine is only able to act as a bleaching agent when 



water is present. 



99. What is bleaching powder, how is it made, and of what does it 



consist ? What substances can be used to liberate its chlorine 

 when required as a bleaching agent or disinfectant ? 

 100. What is permanganate of potash, ozone, and peroxide of hydrogen ? 

 Why should these substances act as oxidising agents ? Compare 

 their action and that of chlorine with the action of sulphurous acid 

 as bleaching agents. 

 *loi. Of the two liquids one is an oxide, the other the solution of a per- 

 oxide. Identify the peroxide by its action as an oxidising agent. 

 (Water and peroxide of hydrogen solution. ) 



Nitrogen : Ammonia. 



102. Recapitulate the properties of nitrogen gas. What purpose does it 



serve in the atmosphere in respect to combustion? How may 

 nitrogen be obtained from the air? What impurity will such 

 nitrogen contain ? 



103. What compound of nitrogen is produced when nitrogenous organic 



matter decays or is destructively distilled? In what important 

 respect does this compound differ from the corresponding com- 



pounds of chlorine and sulph 



ur 



104. How is ammonia gas prepared ? Why must quicklime, and not oil 



of vitriol, be employed to dry the gas ? 



105. Describe the properties of ammonia gas in respect to its colour, 



smell, density, combustibility, and solubility in water. What 

 makes ammonia gas difficult to burn, and how could it be 

 rendered combustible ? 



