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- 1. Multiple Choice
Given the reaction:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
The oxidation number of Zn(s) increases because it
loses electrons
gains electrons
loses protons
gains protons
- 2. Multiple Choice
Which change in oxidation number represents reduction?
–1 to +1
–1 to –2
–1 to +2
–1 to 0
- 3. Multiple Choice
Given the reaction:
F2(g) + 2 Br–(aq) → Br2() + 2 F–(aq)
Which species is reduced?
F2(g)
Br–(aq)
Br2 (l)
F–(aq)
- 4. Multiple Choice
Given the oxidation-reduction reaction:
H2 + 2 Fe+3 → 2 H+ + 2 Fe+2
Which species undergoes reduction?
H2
Fe3+
H+
Fe2+
- 5. Multiple Choice
Given the cell reaction:
Ca(s) + Mg2+(aq) → Ca2+(aq) + Mg(s)
Which substance was oxidized?
Ca(s)
Mg2+(aq)
Ca2+(aq)
Mg(s)
- 6. Multiple Choice
In the reaction
2 Fe3+ + S2– → 2 Fe2+ + S0,
the species oxidized is
Fe3+
S2–
Fe2+
S0
- 7. Multiple Choice
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
gains electrons and is the reducing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
- 8. Multiple Choice
In the reaction
2 Mg + O2 → 2 MgO
the magnesium is the
oxidizing agent and is reduced
oxidizing agent and is oxidized
reducing agent and is reduced
reducing agent and is oxidized
- 9. Multiple Choice
Given the redox reaction:
Fe2+(aq) + Zn(s) → Zn2+(aq) + Fe(s)
Which species acts as a reducing agent?
Fe(s)
Fe2+(aq)
Zn(s)
Zn2+(aq)
- 10. Multiple Choice
Which half-reaction correctly represents oxidation?
Sn2+ + 2e– → Sn0
Sn4+ + 2e– → Sn2+
Sn2+ → Sn0 + 2e–
Sn2+ → Sn4+ + 2e–
- 11. Multiple Choice
Which balanced equation represents an oxidation-reduction reaction?
AgNO3 + NaCl → AgCl + NaNO3
BaCl2 +K2CO3 → BaCO3 +2KCl
CuO + CO → Cu + CO2
HCl + KOH → KCl + H2O
- 12. Multiple Choice
Oxidation is the _________ of electrons.
loss
gain
sharing
transfer
- 13. Multiple ChoiceAnother name for a "oxidation-reduction" reaction ischemical reactionneutralization reactionredox reactionnuclear reaction
- 14. Multiple Choice
Reduction is the ___________ of electrons.
loss
gain
sharing
transfer
- 15. Multiple Choice
Gaining oxygen is an example of...
oxidation
reduction
- 16. Multiple Choice
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
gains electrons and is the reducing agent
- 17. Multiple ChoiceWhich statement is true:
Mg → Mg2+ + 2e–Mg gains 2 electronsMg2+ loses 2 electronsMg loses 1 electronMg loses 2 electrons - 18. Multiple ChoiceWhich of the following half reactions correctly represents a reduction half reaction?Fe →Fe2+ + 2e-Pb4+ + 2e- →Pb2+2O-2 →O2 + 4e-Fe + 3e- →Fe3+
- 19. Multiple Choice
If an atom loses two electrons what charge will it have?
+1
-2
-1
+2
- 20. Multiple Choice
Which of the word equations below shows the reduction of iron oxide when it reacts with carbon
iron oxide + carbon (changes into) iron + carbon dioxide
iron +carbon dioxide (changes into) iron oxide + carbon
iron oxide (changes into) carbon dioxide
- 21. Multiple Choice
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
gains electrons and is the reducing agent
- 22. Multiple Choice
Identify the species reduced in the following reaction.
Fe(s) + 2 Ag+(aq) → Fe2+(aq) + 2 Ag(s)
Fe
Ag
none of these
None of the above
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