Practice Quiz

Praxis II General Science

Category - Chemistry

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For an oxidation reduction reaction to occur spontaneously, which of the following needs to be true?
  1. The electrochemical potential of reduction needs to be greater than that of oxidation.
  2. The electrochemical potential of oxidation needs to be greater than that of reduction.
  3. The del-G of the reaction needs to be positive.
  4. The enthalpy of the reaction needs to be near zero.
  5. The difference in electrochemical potentials of oxidation and reduction needs to be greater than zero.
Explanation
Answer: B - For a redox reaction to occur spontaneously, the electrochemical potential of the oxidation reaction needs to be greater than that of the reduction reaction, meaning electrons need to ‘want to leave’ the reducing species. If not, then the reaction could occur, but will need some added catalyst or other reaction enhancer.
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