The ionic radii of \( \mathrm{Fe}^{2+} \) and \( \mathrm{Fe}^{3+} \) are \( x \) and \( y \), re...

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The ionic radii of \( \mathrm{Fe}^{2+} \) and \( \mathrm{Fe}^{3+} \) are \( x \) and \( y \), respectively. The correct relationship between \( x \) and \( y \) is:
(a) \( xy \)
(b) \( xy \)
(c) \( x=y \)
(d) Cannot be predicted
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