Which of the following chemical reactions is an oxidation-reduction reaction?
Question description
Which of the following chemical reactions is an oxidation-reduction reaction? CuSO4 + BaCl2 yields BaSO4 + CuCl2 AgNO3 + NaCl yields AgCl + NaNO3 Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3 Zn + H2SO4 yields ZnSO4 + H2
Which of the following describes an element that is oxidized in a reaction? (2 points)
| It gains electrons during a reaction. | |
| It has a decrease in its oxidation number. | |
| Al Al3+ + 3e− | |
| F2 + 2e− 2 F− |
5.
(07.05 LC)
Which of the following describes an element that is reduced in a reaction? (2 points)
| It acts in the reactant that is the reducing agent. | |
| It has a decrease in its oxidation number. | |
| Cd Cd2+ + 2e− | |
| Zn + Cu2+ Zn2+ + Cu |
6.
(07.05 MC)
Consider the following reaction:
Cl2 + 2NaBr 2NaCl + Br2
Which element is oxidized and which is reduced in the reaction? (2 points)
| Br is reduced and Na is oxidized. | |
| Cl is reduced and Br is oxidized. | |
| Cl is reduced and Na is oxidized. | |
| Na is reduced and Br is oxidized. |
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