Synthetic Inorganic Chemistry

GENERAL QUESTIONS XI 351

3. Give the formulas and names of salts derived from each of
   the three oxides of chromium, CrO, Cr 2 O 3 , CrO 3. In which of its
   compounds does chromium most resemble sulphur? iron and
   aluminum? nickel, cobalt, copper, and zinc?


4. Give the formulas and names of salts derived from each of
   the oxides of manganese, MnO, Mn 2 O 3 , MnO 2 , MnO 3 , Mn 2 O 7. In
   which of its compounds does manganese most resemble chlorine?
   aluminum? cobalt, nickel, copper, and zinc? sulphur? lead in the
   dioxide?


5. Give a definition of oxidation and reduction. Consider
   two examples, (a) the action of KMnO 4 with H 2 SO 3 , and (6) the
   action of K 2 Cr 207 with HCl. For both of these cases write equa-
   tions according to the oxide method as outlined in Question 1,
   under Preparation 64, Chromic Alum. Also write the equations
   according to the valence method as outlined in Question 3 under the
   same preparation.