Which of the following statement is/are ...

Which of the following statement is/are correct
A) \(MnO_{4}^{-}\) ions act as self indicator
B) In acidic medium \(MnO_{4}^{-}\) change to \(Mn^{2+}\)
C) \(Cr_{2}O_{7}^{2-}\) ions act as self indicator
D) \(Cr_{2}O_{7}^{2-}\) is an oxidizing agent

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