280 REPORT—1890. 
HIGHER. 
1884 . . .. 5 1887 d A mee | 
1885 5 . : 9 1888 A ‘ . 19 
1886 5 as 
JUNIOR STUDENTS. 
CHEMISTRY. 
Candidates must not attempt more than six questions. 
1. Define the terms atomic weight and molecular weight. 
Find the molecular weight of an element, 1 gram of which, in the state of 
vapour, fills the same space that ‘016 gram of hydrogen fills at the same tempera- 
ture and pressure. 
2. Show by what tests, or general characters, you would identify each of the 
following gases: nitrogen monoxide; sulphur dioxide ; ammonia; chlorine. 
3. Explain what is usually understood by valency or quanti-valence. 
Given two elements whose chemical symbols are A and B, and whose valencies 
are if and y respectively, what would be the most probable formula for a compound 
of them P 
4. Describe a method of preparing nitric oxide, and give a sketch of the 
apparatus you would employ. 
Why is the formula of this compound written NO and not N,O, ? 
5. What conclusions would you draw with regard to the chemical characters 
of the substances a, b, c, and d respectively, from the following experiments :— 
a, when acted upon by hydrochloric acid, gives a metallic chloride and water only ; - 
6, when acted upon by hydrochloric acid, gives a metallic chloride, water, and 
chlorine; ¢ liberates iodine from potassium iodide; d@ converts ferric salts into 
ferrous salts ? 
6. Describe briefly how metallic lead is obtained from its ores. Show how each 
of the oxides of lead may be prepared. 
7. Explain, in general terms, what takes place when an electric current is passed 
through a solution of a metallic salt. 
8. How is hydrochloric acid prepared ? 
What weight of hydrochloric acid gas would be necessary in order to com- 
pletely decompose one gram of silver nitrate ¢ 
[H=1, N=14, 0=16, Ag=108, Cl=35°5.] 
PRactIcaAL CHEMISTRY. 
_ (N.B.—Credit will be given for good observations even if the conclusions be 
incorrect, but no credit will be given for experiments not actually made, or for con- 
clusions without the observations on which they are based. | 
1. Determine the metal and acid-radicle in the salt A. Does it contain 
anything besides a metal and an acid-radicle ? 
2. B is the oxide of a metal. Find the metal, and examine the oxide with a view 
of ascertaining whether it is a basic ovide, peroxtde, or acid-forming oxide, 
3. Examine C in the dry way only. 
SENIOR STUDENTS. 
CHEMISTRY. 
1, Nitrogen unites with oxygen to form five oxides: state the chemical laws 
which these oxides illustrate. 
2. Give the characteristics of each of the following classes of oxides :—basic 
oxides, acid-forming oxides (anhydrides), and peroxides ; illustrate your answer by 
reference to the oxides of the following elements: S, Ba, Cr, H. 
