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- 1. Multiple ChoiceAnother name for a "oxidation-reduction" reaction ischemical reactionneutralization reactionredox reactionnuclear reaction
- 2. Multiple Choice
Oxidation is the _________ of electrons.
loss
gain
sharing
transfer
- 3. Multiple Choice
Reduction is the ___________ of electrons.
loss
gain
sharing
transfer
- 4. Multiple Choice
Gaining oxygen is an example of...
oxidation
reduction
- 5. 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
- 6. Multiple ChoiceWhich statement is true:
Mg → Mg2+ + 2e–Mg gains 2 electronsMg2+ loses 2 electronsMg loses 1 electronMg loses 2 electrons - 7. Multiple ChoiceIf an atom loses electrons during a chemical reaction, the atom was:OxidizedReducedNeutralizedPrecipitated
- 8. Multiple ChoiceIn the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________ReducedSynthesizedOxidizedNone of the above - 9. Multiple Choice
Substance that oxidizes another substance by accepting its electrons.
reducing agent
oxidation number
combustion
oxidizing agent
- 10. Multiple ChoiceIn the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?ZincHydrogenOxygenNone - 11. Multiple ChoiceWhat substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3IronFluorineOxygen - 12. Multiple Choice
In the reaction
4 NH3 + 5 O2 → 4 NO + 6 H2O
the oxidation number of nitrogen changes from
–2 to –3
–2 to +3
–3 to –2
–3 to +2
- 13. Multiple Choice
What is the oxidation number of chromium in K2Cr2O7 ?
+12
+2
+3
+6
- 14. Multiple Choice
In which substance does hydrogen have an oxidation number of zero?
LiH
H2O
H2S
H2
- 15. Multiple Choice
What is the oxidation state of phosphorus in the
compound Na3PO3?
0
-3
+3
+5
- 16. Multiple Choice
Which change in oxidation number represents reduction?
–1 to +1
–1 to –2
–1 to +2
–1 to 0
- 17. 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
- 18. Multiple Choice
What is the oxidation number of nitrogen in HNO2?
-1
-2
+3
+4
- 19. Multiple Choice
What is the oxidation number assigned to manganese in KMnO4?
+7
+2
+4
+3
- 20. Multiple Choice
In which substance does sulfur have a negative oxidation number?
S
CaSO4
Na2S
SO2
- 21. Multiple Choice
What is the oxidation state of Pb in PbO ?
+2
+4
0
-2
- 22. Multiple Choice
S in HSO4- ?
+5
-6
+6
+2
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