A Level Chemistry OCR Practice Exam

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What occurs in a redox reaction?

Only oxidation takes place
Only reduction takes place
Both reduction and oxidation take place
There is no change in oxidation state

The correct answer is: Both reduction and oxidation take place

In a redox reaction, both oxidation and reduction processes occur simultaneously. Oxidation refers to the loss of electrons or an increase in oxidation state, while reduction involves the gain of electrons or a decrease in oxidation state. This intrinsic connection between the two processes is why redox reactions are characterized by the transfer of electrons from one species to another. The electron donor undergoes oxidation, and the electron acceptor undergoes reduction. Therefore, the presence of both processes is essential for the overall reaction to occur, making the correct answer reflect this dual nature of redox reactions.