Answers Chemistry Oxidation-Reduction — QuizQuestion 10

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Oxidation-Reduction — Quiz

Question 10 • Chemistry

Which of these is an oxidation-reduction reaction?

Answer

A

CaO times s plus cap h sub 2 cap o l rightarrow Ca OH sub 2 s

B

ZnS times s plus 2 cap o sub 2 g rightarrow ZnSO sub 4 times s

C

6 Li sub 2 cap o s plus cap p sub 4 cap o sub 10 g rightarrow 4 Li sub 3 PO sub 4 s

D

SO sub 2 times g plus cap h sub 2 cap o l rightarrow cap h sub 2 SO sub 3 A q

Explanation

In ZnS, sulfur has an oxidation number of −2; in ZnSO₄, it is +6, so sulfur is oxidized. Oxygen changes from 0 in O₂ to −2 in ZnSO₄, so oxygen is reduced. Because oxidation and reduction happen together, ZnS + 2 O₂ → ZnSO₄ is an oxidation-reduction reaction. The other reactions do not change the oxidation numbers of their elements.

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