REDOX 2008 Practice Test

REDOX 2008 Practice Test Name ______

1. Consider the following:
The nitrogen atom in each NO2
A. / loses one electron. / B. / gains one electron. / C. / loses two electrons. / D. / gains two electrons.
2. Which of the following is capable of acting as both a reducing agent and an oxidizing agent? (use logic)
A. / Mg2+ / B. / Zn2+ / C. / Pb2+ / D. / Na+
3.

A. / -10 / B. / +5 / C. / -5 / D. / +10
4. In an experiment to determine the relative strength of oxidizing agents, three metals, Ag, Ru and Pd were placed into solutions containing a cation of the other two metals. The results were recorded in the following data table:

The relative strength of oxidizing agents is
A. / / B. / / C. / / D. /
5.

A. / I>II>III / B. / I>III>II / C. / II>I>III / D. / II>III>I
6. Which of the following represents a spontaneous redox reaction?
A. / / B. /
C. / / D. /
7.
A. /
B. /
C. /
D. /
8. What is true about a chemical species that loses electrons during a chemical reaction?
A. / It is oxidized. / B. / It is called a cathode.
C. / It is an oxidizing agent. / D. / Its oxidation number decreases.
9. How does the oxidation number change for O if Na2O2 is converted to Na and O2 ?
A. / decreases by 1 / B. / increases by 1
C. / no change / D. / increases by 2
10. Consider the following information


A. / / B. /
C. / / D. /
11.
A. / -6 / B. / -4 / C. / -3 / D. / +3
12.
A. / / B. /
C. / / D. /
13.
A. / / B. /
C. / / D. /
14.


A. /
B. /
C. /
D. /
15.
A. / / B. / / C. / / D. /
16. Consider the following electrochemical (voltaic) cell:

What changes occur when the cell is in operation?

A. /

B. /

C. /
D. /
17. Use the following cell for the next question(s) also

In the electrochemical cell shown, the reaction at the anode is
A. / / B. / / C. / / D. /
18. As the cell operates, the mass of
A. / both the lead and magnesium electrodes increase.
B. / both the lead and magnesium electrodes decrease.
C. / the lead electrode decreases and the magnesium electrode increases.
D. / the lead electrode increases and the magnesium electrode decreases.
19. As a standard Zn Ni electrochemical cell is allowed to reach equilibrium, several changes take place. Which of the following best describes the typical changes which occur?

A. /
B. /
C. /
D. /
20.
A. /
B. /
C. /
D. /
21. Use the following diagram to answer the next 2 questions

Which of the following gives the anode material and its correct half-reaction?

A. /
B. /
C. /
D. /
22. After the cell above has operated for a time, ion migration through the porous barrier has taken place. What observation would be expected from the resulting mixtures?
A. / A solid would form on the silver electrode.
B. / A precipitate would form in both half-cells.
C. / A precipitate would form in the silver half-cell only.
D. / A precipitate would form in the chlorine half-cell only.
23. Use this diagram for the next 3 questions

A. / / B. /
C. / / D. /
24. Which of the following best describes the movement of potassium ions and electrons as the cell operates?

A. /
B. /
C. /
D. /
25. What is the standard cell voltage?
A. / - 0.75 V / B. / 0.62 V / C. / + 0.62 V / D. / + 1.43 V
26. A piece of iron can be prevented from corroding by
A. / making it a cathode. / B. / placing it in an acidic solution.
C. / attaching a small piece of lead to it. / D. / attaching a small piece of gold to it.
27. A student constructs three standard electrochemical cells using the metals Pd, Cd and Ga with 1.0 M solutions of their ions. The student then records the voltages of Cell 1 and Cell 2 in the following table.

What voltage should Cell 3 produce?
A. / -1.34 V / B. / -1.02 V / C. / + 1.02 V / D. / + 1.34 V
28. Which of the following are produced at the anode and cathode in the electrolysis of
aqueous potassium sulfate using carbon electrodes?

A. /

B. /
C. /

D. /

29.
A. / / B. / / C. / / D. /
30.
A. / Ni / B. / Zn / C. / Br2 / D. / Br-
31. Which of the following species is consumed during the electrolysis of aqueous CuSO4 when using a copper cathode and a carbon anode?
A. / O2 / B. / Cu / C. / Cu2+ / D. / SO42 -
32. Which of the following would prevent the corrosion of an iron nail?
A. / Store the nail in Cl2 (g)
B. / Store the nail in a beaker of distilled water.
C. / Store the nail in dry air.
D. / Store the nail wrapped in cobalt wire in a beaker of distilled water.
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