1. A reaction which involves the loss and gain of electrons.
a. reduction half-reaction
b. oxidation half-reaction
c. redox reaction
d. neutralization reaction
2. A half-reaction that undergoes loss of electron.
a. reduction half-reaction
b. oxidation half-reaction
c. redox reaction
d. combustion reaction
3. A half-reaction that involves the gain of of electron.
a. reduction half-reaction
b. oxidation half-reaction
c. redox reaction
d. combustion reaction
4. A substance that donates electrons.
a. reducing agent
b. oxidizing agent
5. A substance that gains electrons.
a. reducing agent
b. oxidizing agent
6. In the given equation, 4Fe + 3O2 à 2Fe2O3, which is the reducing agent?
a. Fe
b. O2
c. Fe2O3
d. Fe and O2
7. In the above equation, which is the oxidizing agent?
a. Fe
b. O2
c. Fe2O3
d. Fe and O2
8. It is a number that tells the number of electrons lost or gain of an element.
a. atomic number
b. oxidation number
c. mass number
d. atomic mass
9. What is the oxidation number of oxygen in peroxide substances?
a. +1
b. +2
c. -1
d. -2
10. What is the oxidation number of H2?
a. +1
b. +2
c. -1
d. 0
11. What is the oxidation number of sulfur in H2SO4?
a. +6
b. +5
c. +4
d. +3
12. What is the oxidation number of sulfur in H2SO3?
a. +6
b. +5
c. +4
d. +3
13. Which half-reaction below undergoes reduction?
14. Which half-reaction below undergoes oxidation?
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