Discrete Practice Questions

Consult your online resources for Full-Length Exams and Passage-Based Questions (for certain
chapters).

1 . Fractional  distillation    under   atmospheric pressure    would   most    likely  be  used    to  separate

which   of  the following   compounds?

(A)  Methylene  chloride    (boiling    point   of  40°C)   and water   (boiling    point   of  10°C)

(B)  Ethyl  acetate (boiling    point   of  77°C)   and ethanol (boiling    point   of  80°C)

(C)  Aniline    (boiling    point   of  184°C)  and benzyl  alcohol (boiling    point   of  205°C)

(D)  Aniline    (boiling    point   of  184°C)  and water   (boiling    point   of  100°C)

2 . Which   of  the following   compounds   would   be  most    effective   in  extracting  benzoic acid

from    a   diethyl ether   solution?

(A)  Tetrahydrofuran

(B)  Aqueous    hydrochloric    acid

(C)  Aqueous    sodium  hydroxide

(D)  Water

3 . Which   of  the following   would   be  the best    procedure   for extracting  acetaldehyde    from    an

aqueous solution?

(A)  A  single  extraction  with    100 mL  of  ether

(B)  Two    successive  extractions with    50  mL  portions    of  ether

(C)  Three  successive  extractions with    33.3    mL  portions    of  ether

(D)  Four   successive  extractions with    25  mL  portions    of  ether