Take a Diagnostic Exam 1912.A student mixes 50.0 mL of 0.10 M Fe(NO 3 ) 2
solution with 50.0 mL of 0.10 M KOH. A green
precipitate forms, and the concentration of the
hydroxide ion becomes very small. Which of
the following correctly places the concentrations
of the remaining ions in order of decreasing
concentration?
(A) [Fe^2 +] >[NO 3 −] >[K+]
(B) [Fe^2 +] > [K+] > lNO 3 −]
(C) [NO 3 −] > [K+] > [Fe^2 +]
(D) [K+] > [Fe^2 +] > [NO 3 −]
(E) [NO 3 −] > [Fe^2 +] > [K+]Chapter 7
13.14 H++6 Fe^2 ++Cr 2 O 72 −→ 2 Cr^3 ++6 Fe^3 ++
7 H 2 O
The above reaction is used in the titration of an
iron solution. What is the concentration of the
iron solution if it takes 45.20 mL of 0.1000 M
Cr 2 O 72 −solution to titrate 75.00 mL of an acidi-
fied iron solution?(A) 0.1000 M
(B) 0.4520 M
(C) 0.3616 M
(D) 0.7232 M
(E) 0.1808 M14.Manganese, Mn, forms a number of oxides. A
particular oxide is 49.5% mass Mn. What is the
simplest formula for this oxide?
(A) MnO
(B) Mn 2 O 3
(C) Mn 3 O 4
(D) MnO 2
(E) Mn 2 O 715.2 KMnO 4 +5 H 2 C 2 O 4 +3 H 2 SO 4 → K 2 SO 4 +
2 MnSO 4 +10 CO 2 +8 H 2 O
How many moles of MnSO 4 are produced when
2.0 mol of KMnO 4 , 2.5 mol of H 2 C 2 O 4 , and
3.0 mol of H 2 SO 4 are mixed?(A) 1.0 mol
(B) 3.5 mol
(C) 2.0 mol
(D) 2.5 mol
(E) 3.0 mol16.Ba +2 H 2 O→ Ba(OH) 2 +H 2Barium reacts with water according to the above
reaction. What volume of hydrogen gas, at stan-
dard temperature and pressure, is produced from
0.400 mol of barium?(A) 8.96 L
(B) 5.60 L
(C) 4.48 L
(D) 3.36 L
(E) 2.24 LChapter 8
17.A sample of chlorine gas is placed in a container
at constant pressure. The sample is heated until
the absolute temperature is doubled. This will
also double which of the following?(A) potential energy
(B) moles
(C) density
(D) number of molecules
(E) volume18.A balloon contains 2.0 g of hydrogen gas. A
second balloon contains 4.0 g of helium gas.
Both balloons are at the same temperature and
pressure. Pick the falsestatement from the fol-
lowing list.(A) The number of hydrogen molecules is the
same as the number of helium atoms in each
balloon.
(B) The density of the helium in its balloon is
greater than the density of the hydrogen in
its balloon.
(C) The volume of each balloon is the same.
(D) The average speed of the molecules/atoms in
each balloon is the same.
(E) The average kinetic energy of the molecules/
atoms in each balloon is the same.