Which change in oxidation number represents reduction?    a.) –1 to +1 b.) –1 to –2 c.) –1 to 0 d.) –1 to +2

Introductory Chemistry: A Foundation
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ISBN:9781337399425
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Chapter18: Oxidation–reduction Reactions And Electrochemistry
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Problem 7ALQ: In balancing oxidation-reduction equations, why is it permissible to add water to either side of the...
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Which change in oxidation number represents reduction? 
 
a.) –1 to +1
b.) –1 to –2
c.) –1 to 0
d.) –1 to +2
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