Electrochemistry and Applications

Name:

Regi. number:

The standard oxidation potential of Ni/Ni2+ electrode is 0.3 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution with the measured e.m.f. be zero at 25°C? (Assume [Ni2+] = 1M)

• a) 5.08
• b) 4
• c) 4.5
• d) 5.25

An electrochemical cell can only convert electrical energy to chemical energy.

• True
• False

Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?

• a) NaCl
• b) KNO3
• c) KCl
• d) ZnSO4

In voltaic cells, such as those diagrammed in your text, the salt bridge _______ .

• (a) is not necessary in order for the cell to work
• (b) acts as a mechanism to allow mechanical mixing of the solutions
• (c) allows charge balance to be maintained in the cell
• (d) is tightly plugged with firm agar gel through which ions cannot pass
• (e) drives free electrons from one half-cell to the other

In the standard notation for a voltaic cell, the double vertical line "||" represents:

• (a) a phase boundary
• (b) gas electrode
• (c) a wire (metal) connection
• (d) a salt bridge
• (e) a standard hydrogen electrode

In electrolytic conductors, the conductance is due to _____________

• a) Flow of free mobile electrons
• b) Movement of ions
• c) Either movement of electrons or ions
• d) Cannot be said
• flow of ions

Which of the following is the example of the electrolytes?

• a) Acids
• b) Metals
• c) Alloys
• d) Oxides

Which of the following are the strong electrolytes?

• a) HCl
• b) Acetic acid
• c) Propinoic acid
• d) H2SO3