NEW
Font size
WorksheetsRedox Reaction
Total questions: 25
Worksheet time: 25mins
1.)What is oxidation in a chemical reaction?
Gain of electrons
Loss of electrons
Combination with hydrogen
Formation of a new compound
2.)What is the substance called that donates electrons in a redox reaction?
Oxidizing agent
Reducing agent
Catalyst
Inhibitor
3.) In the reaction Zn + Cu2+→Zn2++ Cu, which element is oxidized?
Zinc (Zn)
Copper (Cu)
Both Zn and Cu
Neither Zn nor Cu
4.) Which of the following is the reduction half-reaction in the redox process?
Fe→Fe2+ + 2e−
Cu2+ + 2e−→Cu
Zn→Zn2+ + 2e−
O2 + 4e−→2O2−
5.) What is the role of an oxidizing agent in a redox reaction?
Donates electrons
Accepts electrons
Forms a precipitate
Acts as a catalyst
6.) Which of the following is true about oxidation?
It always involves oxygen.
It always involves a gain of hydrogen.
It involves the loss of electrons.
It involves the formation of water.
7.) What happens to the oxidation state of an element when it is oxidized?
It decreases.
It increases.
It stays the same.
It becomes zero.
8.) In which of the following reactions does reduction occur?
Fe3+ + e−→Fe2+
Zn→Zn2+ + 2e−
Na→Na+ + e−
O2→ O2 2−
9.)Which of the following statements is true about a reducing agent?
It gains electrons.
It loses electrons.
It oxidizes another substance.
It remains unchanged.
10.) In a redox reaction, the substance that is reduced gains electrons.
True
False
11.) Oxidation always involves the addition of oxygen to a substance.
True
False
12.) In a redox reaction, both oxidation and reduction occur simultaneously.
True
False
13.) The loss of electrons by a substance is called reduction.
True
False
14.)When a substance is oxidized, it is also known as the reducing agent.
True
False
15.)In a redox reaction, the substance that donates electrons is called the oxidizing agent.
True
False
16.) In the reaction Cu2+ + 2e−→Cu, copper is being oxidized.
True
False
17.) Which of the following reactions is an example of an oxidation process?
Na→Na+ + e−
O2 + 4e−→2O2−
Cu2+ + 2e−→Cu
Fe3+ + e−→Fe2+
18.) What is the term for the gain of electrons in a chemical reaction?
Reduction
Oxidation
Precipitation
Dissociation
19.) Which of the following best describes a redox reaction?
A reaction involving only the gain of electrons
A reaction involving only the loss of electrons
A reaction involving both oxidation and reduction processes
A reaction that does not involve electron transfer
20.) Which of the following statements is correct?
In a redox reaction, oxidation and reduction occur in separate reactions.
The substance that is oxidized is always the oxidizing agent.
The substance that is reduced always gains electrons.
Oxidation can occur without reduction in a redox reaction.
In a redox reaction, which species undergoes reduction?
The species that loses electrons
The species that gains electrons
The species that donates protons
The species that increases in oxidation state
In the equation MnO4− + 8H+ + 5e−→Mn2+ + 4H2O, what happens to manganese?
It is oxidized.
It is reduced.
It gains protons.
It loses protons.
23.) What happens to the oxidation state of an element when it is reduced?
It increases.
It decreases.
It stays the same.
It becomes positive.
24.) In a redox reaction, what is the substance that is oxidized called?
Oxidizing agent
Reducing agent
Catalyst
Electron donor
25.)In a redox reaction, the substance that gains electrons is called the:
Reducing agent
Oxidizing agent
Catalyst
Electrolyte
