1. 500 mL of 0.020 M BaCl2(aq) is added to 500 mL of 0.020 M NaF(aq). Ksp = 2 x 10¯6 for BaF2 in water.
(A) The solutions mix without reaction
(B) A precipitate of BaF2(s) is formed when the solutions are mixed
(C) Undissolved BaCl2 solid dissolves when the solutions are mixed
(D) The concentrations of all the ions in the final solution are 2 x 10¯6 M.
2. Which aqueous solution should be neutral?
(A) NH4Cl
(B) Na(ClO4)2
(C) KCN
(D) NaHSO4
3. The pH of a solution of vinegar is 3.00. The concentration of OH¯ ion in this solution is
(A) 3.00 M
(B) 1 x 10¯3 M
(C) 1 x 10¯11 M
(D) 17 M
4. The indicator ravishing red has a color change from yellow to red in the pH range 6.5- 7.5. This indicator would be used to titrate
(A) a weak acid with a strong base
(B) a strong acid with a weak base
(C) a weak acid with a weaker acid
(D) a strong acid with a strong base
5. If the Ka of a weak acid is 5 x 10¯4, the pH of a 0.2 M solution of the acid will be about
(A) 0.7
(B) 2.0
(C) 3.3
(D) 7.0
6. Given the standard electrode (reduction) potentials:
| Cd2+(aq) + 2e¯ ---> Cd(s) | E° = -0.40 v |
| Ag+(aq) + e¯ ---> Ag(s) | E° = +0.80 v |
What would be the E° for a cadmium-silver cell?
(A) 0.4 v
(B) 0.5 v
(C) 1.2 v
(D) 2.0 v
7. Consider the following reaction at equilibrium in a container of constant volume:
| 2 SO2(g) + O2(g) <===> 2 SO3(g) | DH = -7.8 kcal |
Which of the following would result in a greater concentration of SO2?
(A) addition of O2
(B) addition of SO3
(C) removal of SO3
(D) a decrease in temperature
8. A current of 10.0 amperes flows for 2.00 hours through an electrolytic cell containing a molten salt of metal x. This results in the decomposition of 0.250 mole of metal x at the cathode. The oxidation state of x in the molten salt is
(A) 1+
(B) 2+
(C) 3+
(D) 4+
9. In a voltaic cell, oxidation occurs at the
(A) anode
(B) cathode
(C) salt bridge
(D) electrode at which electrons enter from the outside
10. The free energy change for the chemical reaction that occurs in a voltaic cell when it is discharging and producing an electric current must be
login or register to view answers(A) positive
(B) negative
(C) zero
(D) unpredictable
