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Question

Quantitative estimation of  Fe to the power of 2 plus end exponent can be made by KMnO subscript 4 in acidified medium. In which medium it can be estimated by KMnO subscript 4 space?

  1. In straight H subscript 2 SO subscript 4
  2. In HNO subscript 3
  3. IN HCI
  4. All of these

The correct answer is: In straight H subscript 2 SO subscript 4

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