Which statement describes reduction?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which statement describes reduction?

Explanation:
Reduction is the gain of electrons by a substance, which lowers its oxidation state. Since electrons are negatively charged, adding electrons to an atom or ion reduces its oxidation number. This is why gaining electrons is the defining feature of reduction. In contrast, losing electrons describes oxidation (which increases the oxidation number). Energy changes can occur in many processes and aren’t the defining characteristic of reduction. An increase in oxidation number also points to oxidation, not reduction.

Reduction is the gain of electrons by a substance, which lowers its oxidation state. Since electrons are negatively charged, adding electrons to an atom or ion reduces its oxidation number. This is why gaining electrons is the defining feature of reduction. In contrast, losing electrons describes oxidation (which increases the oxidation number). Energy changes can occur in many processes and aren’t the defining characteristic of reduction. An increase in oxidation number also points to oxidation, not reduction.

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