4. In preparing nitric acid, how much oil of yitriol and how much salt-
petre must be taken in order to obtain a pound of nitric acid ?

6. By experiment we find the specific grKYity of ammonia gas to be
8.62 ; how can we apply this observation in determining the composition
of ammonia 1

6. What gaseous compounds of hydrogen can be readily dissociated by
heat? lilS'r X

7. How can we determine the composition of sulphurous acid by the
way of synthesis ?

8. Write the symbols of all the oxygen acids in the " nitrogen g^up
of elements."

9. How many pounds of nitrogen are there in 100 pounds of saltpetre ?

10. Define the meaning of the terms "isomorphism," "dimorphism,"
" allotropism,'' and " isomerism."

11. Name four important uses of carbon.
12. How is phosphorus prepared ?

13. How would you detect the presence of chlorine in any mixture 1

14. How is nitrous oxide prepared ? Describe the matter by symbols.
15. How would you prove beyond cavil that carbon is given out during
the respiration of animals 1

16. How much air is necessary to bum completely 10 grms. of pure
carbon ?

17. In what proportions should chlorhydric acid and black oxide of
manganese be mixed to generate chlorine ?

18. What is the chemical explanation of the action of chlorine in
bleaching ?

19. Describe the reactions in a candle flame.
20. How would you determine the atomic weight of silicon ?



EXAMINATION PAPERS. 65



January, 1871.
