Answers Chemistry Oxidation-Reduction — QuizQuestion 4

4

QuizMultiple Choice

Oxidation-Reduction — Quiz

Question 4 • Chemistry

Which of these is an oxidation-reduction reaction?

Answer

A

Pb open paren NO sub 3 close paren sub 2 plus Na sub 2 SO sub 4 rightarrow 2 NaNO sub 3 plus PbSO sub 4

B

2 NaOH plus cap h sub 2 CO sub 3 rightarrow Na sub 2 CO sub 3 plus 2 NaOH

C

Fe sub 2 cap o sub 3 plus 3 CO rightarrow 2 Fe plus 3 CO sub 2

D

CuSO sub 4 plus 2 NaOH rightarrow Cu OH sub 2 plus Na sub 2 SO sub 4

Explanation

In choice C, iron in Fe₂O₃ changes from an oxidation state of +3 to 0 in elemental Fe, so it is reduced. Carbon in CO changes from +2 to +4 in CO₂, so it is oxidized. Because oxidation and reduction occur together, Fe₂O₃ reacting with CO is an oxidation-reduction reaction.

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