Q. In electrolysis, what is produced at the cathode?
-
A.
Oxygen gas
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B.
Hydrogen gas
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C.
Metal ions
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D.
Salt
Solution
During electrolysis, hydrogen gas is produced at the cathode when water is electrolyzed.
Correct Answer:
B
— Hydrogen gas
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Q. What does the term 'overpotential' refer to?
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A.
The potential difference needed to drive a reaction
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B.
The maximum voltage of a cell
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C.
The energy lost as heat
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D.
The efficiency of a battery
Solution
Overpotential refers to the extra potential required to drive an electrochemical reaction beyond its equilibrium potential.
Correct Answer:
A
— The potential difference needed to drive a reaction
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Q. What is the effect of increasing temperature on the rate of an electrochemical reaction?
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A.
Decreases rate
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B.
Increases rate
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C.
No effect
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D.
Reverses reaction
Solution
Increasing temperature generally increases the rate of an electrochemical reaction due to higher kinetic energy.
Correct Answer:
B
— Increases rate
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Q. Which factor does NOT affect the conductivity of an electrolyte solution?
-
A.
Concentration of ions
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B.
Temperature
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C.
Nature of solvent
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D.
Color of solution
Solution
The color of the solution does not affect the conductivity of an electrolyte solution.
Correct Answer:
D
— Color of solution
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Q. Which of the following statements about electrochemical cells is true?
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A.
They convert chemical energy to electrical energy
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B.
They only work in acidic solutions
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C.
They cannot be reversed
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D.
They require a vacuum to operate
Solution
Electrochemical cells convert chemical energy into electrical energy during spontaneous reactions.
Correct Answer:
A
— They convert chemical energy to electrical energy
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