Oxidation-Reduction Answers

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Which of these reactions are redox reactions? Check all that apply.

A
Cd + HCl → CdCl2 + H2
B
CuCl2 + Na2S → 2NaCl + CuS
C
CaCO3 → CaO + CO2
D
2ZnS + 3O2 → 2ZnO + 2SO2
E
CH4 + 2O2 → CO2 + 2H2O
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Answer:

The oxidation number of carbon changes from −1 to +4, and oxygen changes from 0 to −2. Carbon is oxidized, while oxygen is reduced. Electrons are transferred from carbon to oxygen.

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