87 Решение задачки по химии №08 765

4. a) Is it possible to reduce Cl2 to Cl- by the action of Fe2? I2 to I-? Sn4 to Sn2 ? MnO4 in acid medium to Mn2 ? Cr2O72- in an acid medium to Cr3?
b) What are redox indicators? What chemical process causes the color change.

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