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MDCAT
Chemistry
2018

Chemistry · Electrochemistry

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question

In acidic medium, oxidation action of potassium permanganate depends upon:

Options
  • A

    Mn7+

  • B

    KMnO2+

  • C

    MnO2

  • D

    Mn1+

  • E

    Mn4+

Explanation

Equation for reduction of KMnO4 in acidic medium:

8H+ + MnO4- + 5e- ----> Mn2+ + 4H2O

Here in MnO4- the oxidation state of Mn is +7, and it is being reduced to Mn2+

Therefore, it acts as an oxidising agent as Mn7+ can gain elections from the substance being oxidised and get reduced itself.

In acidic medium the reaction for potassium permanganate can be given as:

8H+ + MnO4- + 5e- —> Mn2+ + 4H2O

From the equation it can be seen that the oxidation state of Mn is decreased from +7 to +2 so it acts as an oxidizing agent and resultantly the oxidation state of potassium permanganate depends on Mn+7.

In acidic medium the reaction for potassium permanganate can be given as

8H+ + MnO4- + 5e- —> Mn2+ + 4H2O

From the equation it can be seen that the oxidation state of Mn is decreased from +7 to +2 so it acts as an oxidizing agent and resultantly the oxidation state of potassium permanganate depends on Mn+7.

In acidic medium the reaction for potassium permanganate can be given as

8H+ + MnO4- + 5e- —> Mn2+ + 4H2O

From the equation it can be seen that the oxidation state of Mn is decreased from +7 to +2 so it acts as an oxidizing agent and resultantly the oxidation state of potassium permanganate depends on Mn+7.

In acidic medium the reaction for potassium permanganate can be given as

8H+ + MnO4- + 5e- —> Mn2+ + 4H2O

From the equation it can be seen that the oxidation state of Mn is decreased from +7 to +2 so it acts as an oxidizing agent and resultantly the oxidation state of potassium permanganate depends on Mn+7.

False.

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Tagged under Chemistry · Electrochemistry · 2018