AmMay'"iiSfrm'}  Pharmaceutical  Colleges  and  Associations.  253. 
D — What  are  the  chief  ores  of  Zinc  and  how  is  the  metal  obtained  from 
them  ?  Mention  the  most  important  uses  of  Zinc  and  of  its  alloys.  Give  the 
names  and  formulas  of  the  official  salts  of  Zinc. 
E — Give  the  chemical  formulas  of  Potassii  Bichromas  and  of  Acidum 
Chromicum.  State  how  the  latter  preparation  is  obtained  from  the  former. 
Write  the  reaction  for  the  reduction  of  Potassium  Bichromate  by  Oxalic  Acid 
in  the  presence  of  Sulphuric  Acid.  Write  the  corresponding  reaction  when 
free  Hydrochloric  Acid  is  used  instead  of  Sulphuric. 
F-— Write  the  graphic  formulas  of  the  two  isomeric  Propyl  Alcohols.  State 
the  effects  of  oxidation  upon  each  of  these  and  describe  the  products  of  such 
oxidation. 
G — To  what  class  of  organic  compounds  does  Glycerin  belong  ?  From 
what  natural  sources  is  it  extracted  and  by  what  several  methods  ?  Illustrate 
by  reactions.  Give  the  formula  and  name  of  the  compound  obtained  by  the 
action  of  strong  Nitric  Acid  upon  it. 
//—Give  the  formula  of  Acidum  Salicylicum.  State  the  natural  sources 
of  it  and  how  it  is  prepared  from  them.  Write  the  reaction  for  its  synthetic 
formation  as  now  carried  out.  Give  the  formulas  of  Sodium  Salicylate  and  of 
Salol. 
/ — Describe  the  appearance  and  properties  of  Naphthalene  and  state  the 
sources  from  which  it  is  obtained.  What  are  some  of  the  pharmaceutical  and 
technical  uses  of  Naphthalene  ?    Write  the  graphic  formula  of  /3-Naphthol. 
A"— Give  the  correct  chemical  names  for  the  following  : 
C5Hn-0-N=0    CH3  CI=CI. 
I       1       )nh      coh  ch 
co     ci=cix         //\  //\ 
I                               HC    C.OCH3  HC  CH 
CH3                              I     II  I  || 
HC    C.COH  HC  CH 
^/  ^/ 
CH  N 
EXAMINING  COMMITTEE. 
A — What  are  Volatile  Oils?  Name  the  two  most  important  classes  of 
volatile  oils.  Of  what  two  principles  do  volatile  oils  proximately  consist  ? 
What  is  the  most  characteristic  feature  of  volatile  oils  ?  Describe  two  methods 
by  which  volatile  oils  may  be  obtained,  with  an  example  of  an  oil  obtained  by 
each  process.  How  may  the  adulteration  of  volatile  oils  by  a  fixed  oil  be 
detected  ?  How  may  the  presence  of  alcohol  be  shown  ?  What  is  the  source 
of  Oil  of  Origanum  ?  What  is  the  chemical  synonym  for  Oil  of  Gaultheria  ? 
Name  a  volatile  oil  produced  by  chemical  action  in  the  presence  of  water. 
B — What  is  the  commercial  source  of  Ammonium  Salts  or  Compounds  ? 
How  is  commercial  Ammonium  Chloride  purified?  How  is  Ammonia  Gas 
made  from  it  ?  In  what  two  forms  is  ammonia  gas  officially  recognized  ? 
Give  the  percentage  of  gas  in  each  preparation.  How  is  Ammonium  Carbonate 
made  ?  What  is  its  chemical  composition  and  formula  in  symbols  ?  '  What 
change  takes  place  in  the  official  ammonium  carbonate  on  exposure  to  air  ? 
C — From  what  sources  are  Tannic  and  Gallic  Acids  prepared  ?  What 
chemical  relation  exists  between  gallic  and  tannic  acid?    Give  an  outline  of 
