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Between the couple Cr^(3+)//Cr^(2+) and ...

Between the couple `Cr^(3+)//Cr^(2+)` and `Fe^(3+)//Fe^(2+)` whose E value is more positive? Why?

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R G PUBLICATION-THE d-AND f-BLOCK ELEMENTS-EXERCISE
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  12. Write the composition of mischmetal.

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