Redox Reactions- Level 2

What is oxidized in the reaction below?

H₂O₂ + Cl₂ --> O₂ + Cl^-

• H₂O₂

• Cl₂

• O₂

• Cl^-

What is the oxidant in the following reaction?

H₂O₂ + Cl₂ --> O₂ + Cl^-

• H₂O₂

• Cl₂

• O₂

• Cl^-

What is the oxidation number of Mn in MnO₄^-?

• +2

• -1

• +7

• +5

What is the oxidation number of Cr is Cr₂O₇^2-?

• +3

• +6

• +12

• -2

What is the oxidation number of O in H₂O₂?

• -1

• -2

• 0

• 1

Check the correct statements below:

• Oxidation is the gain of electrons.

• Oxidation is the loss of electrons.

• The oxidation reaction is when the oxidation number increases.

• The reduction reaction is when the oxidation number decreases.

Which of the following is an oxidation reaction? (hint use oxidation number)

• MnO₄^- --> Mn²⁺

• Cr₂O₇^2---> Cr³⁺

• H₂O₂---> H₂O

• IO --> IO₃^-

State whether the following reaction is oxidation or reduction?

2I^- --> I₂ + 2e^-

• Oxidation

• Reduction

• Neither

• Ionic

How many electrons are lost when H₂O₂ oxidizes to O₂?

• 1

• 2

• 3

• 4

What is the final observation for the following reaction? (refer to resource sheet)

Fe²⁺ + Cr₂O₇^2- --> Cr³⁺ + Fe³⁺

• Green/orange

• Greenish orange solution

• Greenish orange solution with some metal

• Purple