In the reaction Fe2O3 + 3 H2 2 Fe + 3 H2O, the reducing agent is
A) Fe2O3.
B) H2.
C) Fe.
D) H2O.
Question 2
The color of quartz crystals is due to
A) the arrangement of silicon and oxygen atoms.
B) inorganic impurities.
C) magnesium.
D) organic substances.