Multiple Choice
Which of the following chemical reactions is an oxidation-reduction (redox) reaction?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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In a redox reaction, which term best describes a reduction?
A
Gain of electrons by a species
B
Increase in oxidation number
C
Release of oxygen gas
D
Loss of electrons by a species
Verified step by step guidance1
Understand that reduction in a redox reaction refers to the process where a species gains electrons.
Recall that gaining electrons decreases the oxidation number of the species, so reduction corresponds to a decrease, not an increase, in oxidation number.
Recognize that the release of oxygen gas is not a defining feature of reduction; it may occur in some reactions but is not a general characteristic.
Note that loss of electrons by a species is actually oxidation, the opposite of reduction.
Therefore, the best description of reduction is the gain of electrons by a species.
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