286 REPORT—1890. 
or Ca0.H,0+Cl, = 
CH,+20,= 
CO, + C= 
Ca,P,0, + 2H,SO, = 
7. When iron pyrites is carefully burnt, the reaction is as follows :-—— 
2F eS, + 70 = Fe,0, + 280,. 
Fe=56, O=16, S=82. 
Calculate the quantity of air required to burn a ton (2240 lbs.) of pyrites, reckon- 
ing the oxygen in the air to be 23 per cent. by weight. f 
CHEMISTRY, 
Il. 
[N.B.—WNot more than EIGHT questions to be attempted. ] 
1. Define clearly the following terms :—Symbol, acid, equivalence, compound 
radical, chemical equation, halogen. 
2. Give the chemical name, and also the formule, of the following substances :—- 
kitchen salt, sal-ammoniac, plaster of Paris, white lead, calomel, oil of vitriol. 
8. Describe two processes for obtaining chlorine, Describe its properties and 
uses. 
4, What do you understand by allotropism? Describe the allotropic forms 
of the non-metallic elements. 
5. What is the composition of ordinary atmospheric air? Describe experi- 
ments by which the presence of each of its constituents may be demonstrated. 
6. What are the ordinary impurities of spring water, and how may they be 
detected ? 
7. What do you understand by ard and soft water? How could you ascertain 
the degree of hardness ? 
8. Explain, in words, the reactions expressed in the following equations :— 
‘ (a) K,CO, + H,SO, = CO, + H,0 + K,S0, ; 
(6) H,NCl+ NaNO, = NaCl +2H,0 +N, ; 
(c) KNO, + H,SO, = HKSO, + HNO,. 
9. Name the chief elements which enter into the composition of (a) water, (b) 
air, (c) flint, (d) clay, (¢) coal, (7) limestone. 
10. What do you understand by combustion? Describe an experiment by 
which air might be burnt. 
11. A sample of coal contains 84 per cent. available carbon and 6 per cent. 
available hydrogen: what weight of atmospheric air will be required to burn 
1 ewt. of the coal ? 
12. In the course of an analysis, ‘4865 gram of silver chloride was obtained 
from 1 gram of an alloy which had been dissolved in nitric acid: what percentage 
of silver did the alloy contain ? 
SCIENCE AND ART DEPARTMENT. 
Inorganic CHEMISTRY. 
First Stage or Elementary Examination. 
INSTRUCTIONS. 
You are permitted to attempt only eight questions. 
Whenever possible, you are to express the reactions in equations. 
You are to give such numerical details as will show the mode of calculation. 
K=391. Cl=35:5. O=16. 
1. Classify the following substances as elements and compounds: chalk, 
graphite, water, sulphur, iron, ammonia, oil of vitriol, chlorine, diamond, pr 
