Agricultural Education — Examination Papers, 1886. xxiii 
C. ELEMENTARY CHEMISTRY. 
November 10th, 1885. Three Hours Allowed. 
1. What is ozone? How can it be obtained and how dis- 
tinguished '? 
2. Prove synthetically the composition of pure water by weight ? 
3. Define the terms : — atom ; molecule ; quantivalence ; element. 
I. In what distinct form does carbon occur ? "What is the result 
of burning carbon (a) in a limited supply of oxygen (6) in an excess 
of oxygen ? Ho^v can one product be converted into the other, and 
I? ice versa ? 
5. What compounds does sodium form with two following bodies : — 
sulphuric acid, hydrochloric acid, nitric acid, phosphoric acid, car- 
bonic acid, arsenious acid ? Give the formulfe, with the common 
names by which any of the compounds are known. 
6. How would you show whether atmospheric air was a mixture of 
gases or a compound ? 
7. What are the ordinary constituents of coal gas after purifica- 
tion ? What are the chief impurities, and what other important 
bodies are formed in the manufacture of coal gas ? 
8. What takes place when hydrogen and. chlorine gases are mixed? 
What when powdered antimony is thrown into a jar containing 
chlorine ? What when a piece of litmus paper is thrown in ? 
9. What is glass composed of? Name any varieties. How is 
coloured glass obtained ? 
10. How is caustic potash obtained ? How would you distinguish 
between caustic potash, caustic soda, and carbonate of soda ? 
II. Name the principal oxides of iron. How would you dis- 
tinguish ferrous and ferric salts ? 
12. Give chemical names and formulre for the following : — heavy 
spar ; pearl-ash ; nitre ; Epsom salts ; sugar of lead ; litharge ; 
cinnabar. 
D. MENSURATION and LAND SURVEYING. 
November 11th, 1885. Two Hours Allowed. 
1. Draw, to a scale of 100 ft. to an inch, a triangle whose sides 
are 325 ft., 466 ft., and 220 ft. ; and note the number of degrees in 
each angle. 
From the greatest angle let fall a perpendicular to the longest 
side and note its length in feet. 
