What is the change in oxidation state of manganese in the reaction MnO4- + 8H+ +

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Question: What is the change in oxidation state of manganese in the reaction MnO4- + 8H+ + 5e- → Mn2+ + 4H2O? (2023)

Options:

Correct Answer: +7 to +2

Exam Year: 2023

Solution:

Manganese changes from +7 in MnO4- to +2 in Mn2+, indicating a reduction.

What is the change in oxidation state of manganese in the reaction MnO4- + 8H+ + 5e- → Mn2+ + 4H2O? (2023)

What is the change in oxidation state of manganese in the reaction MnO4- + 8H+ + 5e- → Mn2+ + 4H2O? (2023)

Step 1: Identify the oxidation state of manganese in MnO4-. Manganese has an oxidation state of +7 in this compound.
Step 2: Identify the oxidation state of manganese in Mn2+. Manganese has an oxidation state of +2 in this ion.
Step 3: Calculate the change in oxidation state by subtracting the final oxidation state (+2) from the initial oxidation state (+7).
Step 4: The change in oxidation state is +7 - +2 = +5.
Step 5: Since the oxidation state decreases from +7 to +2, this indicates that manganese is being reduced.

Oxidation State Changes – Understanding how to determine the oxidation states of elements in compounds and how they change during a chemical reaction.
Reduction and Oxidation – Recognizing the difference between reduction (gain of electrons) and oxidation (loss of electrons) in redox reactions.
Half-Reaction Method – Using the half-reaction method to balance redox reactions and identify changes in oxidation states.