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Question

The half-cell reaction is the one that:
  1. goes half way to completion
  2. takes place at one electrode
  3. consumes half a unit of electricity
  4. involves half a mole of electrolyte

A
goes half way to completion
B
consumes half a unit of electricity
C
involves half a mole of electrolyte
D
takes place at one electrode
Solution
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A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.
Half-reactions are often used as a method of balancing redox reactions.

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