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Question

________ acid can decolourise purple colored potassium permanganate solution.


A

Sulphuric acid

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B

Citric acid

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C

Carbonic acid

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D

Hydrochloric acid

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Solution

The correct option is B

Citric acid


The explanation for the correct option (B):

  • The chemical formula of potassium permanganate is KMnO4 and the solution of KMnO4is purple in color.
  • When Citric acid (C6H8O7) is added to a potassium permanganate solution, the purple-colored solution turns colorless.
  • The reaction between C6H8O7 and KMnO4, to form Manganese(IV) oxide
    (MnO2) and Carbon dioxide (CO2), Water (H2O), and Potassium ion (K+), is:

C6H8O7(aq)+6KMnO4(aq)+6H+(aq)6MnO2(s)+6CO2(g)+7H2O+6K+

Final Answer: Hence, option (B) is correct. Citric acid can decolorize purple-colored potassium permanganate solution.


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