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AP EAMCET202119 Aug 2021Morning ShiftChemistryRedox ReactionsActual

Which among the following species acts as a self-indicator?

Options

  1. AH 2 O 2
  2. BI −
  3. CCr 2 O 7 2 −
  4. DMnO 4 −

Correct answer

D. MnO 4 −

Step-by-step solution

In the presence of a reducing agent, MnO 4 - ​ acts as self-indicator and changes colour from pink to colourless. Because in MnO 4 - oxidation state of Mn is + 7 and it is in highest oxidation state. Thus will tend to get reduced and easily takes electrons and being a charge transfer complex, shows intense colour. So that's why it is act as self indicator.

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