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PASS ANIMAL BIOLOGY.

Extra-mural students.

1. Distinguish the different classes of the protozoa.

2. Outline the anatomy of the spider.

To what orders do the following insects belong: Mayflies, cicadidæ, houseflies, lice, potato-beetle, fireflies, wasps? Give reasons for your answers.

3. Compare the bones of the front limbs in man, horse, cat, pigeon and frog.

4. Describe the brain of the rabbit, and compare with that of a fish.

5. Describe the ear of the catfish.

JUNIOR CHEMISTRY.

Note.-Extra-mural students who have not done the laboratory work called for in questions 4 and 7, may answer them from their theoretical knowledge.

1. What do you understand by the following terms: combining weight; double salt; electrolyte; hydrolysis; mixture; hydrate; normal solution; strong acid; law; transition point.

2. How does a solution of sodium carbonate in water affect litmus paper? Explain this phenomenon in detail.

3. Discuss the ionic dissociation hypothesis, giving in detail (a) the assumptions of the hypothesis, and (b) the facts which the hypothesis explain.

4. Describe in detail experiments you have performed in the laboratory illustrative of the conditions governing the speed of reactions.

5. Write equations for the following reactions:
(a) Chlorine on hot potassium hydroxide solution.
(b) Sulphuric acid on bleaching powder.

(c) Strong nitric acid on copper.

(d) Hydrochloric acid on litharge.

(e) Hydrochloric acid on manganese dioxide.

6. A certain weight of zinc was dissolved in dilute hydrochloric acid, and the gas evolved was collected over water, the temperature being 20°, and the barometric pressure 767.4 m.m. If the volume of the wet gas under these conditions was 300 c.c., what weight of zinc had been dissolved?

Aqueous tension at 20°-17.4 m.m.

Zn-65.

7. Describe an experiment you have preformed in the laboratory illustrative of the Law of Multiple Proportion. Give equations for any reactions in the experiment, sketch the ap

paratus used, show the method of calculating results, and show how your results illustrate the above-mentioned law.

8. Deduce the chemical equilibrium formula,

[Pcl2] X [Cl2] =K
[Pcl]

from a consideration of the thermal dissociation of phosphorous pentachloride.

9. A 3.3 per cent. solution of hydrogen peroxide in water has a freezing point of -2.03°. Calculate the molecular weight of hydrogen peroxide.

10. Write the formulae for the following compounds :calcium hypochlorite, ferrous ammonium sulphate, mercuric chloride, potassium iodate, ferric thiocyanate, acid calcium carbonate, disodium ammonium phosphate, perchloric anhydride, lead chromate, basic bismuth chloride.

FACULTIES OF ARTS AND APPLIED SCIENCE.

SENIOR CHEMISTRY.

(ORGANIC CHEMISTRY I).

1. (a) Outline the methods for purifying (i) liquids, (ii) solids, illustrating your methods with reference to substances you have worked with in the laboratory.

(b) Describe a method for determining the purity of benzoic acid.

2. (a) Compare alcohols and bases.

(b) Describe, using structural formulae, the products obtainable by oxidation of primary and secondary alcohols.

3. (a)

Describe in detail the preparation and purification of diethyl ether.

(b)

Describe a method for distinguishing between primary, secondary and tertiary amines. Give equations in

full.

4. (a) Outline the preparation of chloroform from acetone, giving equations in full.

mitin.

(b) Discuss saponification, with special reference to pal

5. (a) Classify the carbohydrates, and give the distinguishing characters of each class.

(b) Prove the structure of urea by reference to its preparation from carbonyl chloride.

6. (a) Write a short note on the chemistry of coal tar.
(b) Give structural formulae of the possible tetrachlor-

benzenes.

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