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In a redox reaction, if the oxidation state of manganese changes from +7 to +2,

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Question: In a redox reaction, if the oxidation state of manganese changes from +7 to +2, how many electrons are gained?

Options:

  1. 5
  2. 3
  3. 2
  4. 7

Correct Answer: 2

Solution: 

The change from +7 to +2 indicates a gain of 5 electrons (7 - 2 = 5).

In a redox reaction, if the oxidation state of manganese changes from +7 to +2,

Practice Questions

Q1
In a redox reaction, if the oxidation state of manganese changes from +7 to +2, how many electrons are gained?
  1. 5
  2. 3
  3. 2
  4. 7

Questions & Step-by-Step Solutions

In a redox reaction, if the oxidation state of manganese changes from +7 to +2, how many electrons are gained?
  • Step 1: Identify the initial oxidation state of manganese, which is +7.
  • Step 2: Identify the final oxidation state of manganese, which is +2.
  • Step 3: Calculate the change in oxidation state by subtracting the final state from the initial state: +7 - +2.
  • Step 4: Perform the subtraction: 7 - 2 = 5.
  • Step 5: Since the oxidation state decreased, this means manganese gained electrons. Therefore, it gained 5 electrons.
  • Oxidation States – Understanding how to determine the change in oxidation states in redox reactions.
  • Electron Transfer – Recognizing that a decrease in oxidation state corresponds to the gain of electrons.
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