The ratio of \( \mathrm{Fe}^{3+} \) and \( \mathrm{Fe}^{2+} \) ions in \( \mathrm{Fe}_{0.9} \mat....

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The ratio of \( \mathrm{Fe}^{3+} \) and \( \mathrm{Fe}^{2+} \) ions in \( \mathrm{Fe}_{0.9} \mathrm{~S} \) is
(1) 0.28
(2) 0.5
\( \mathrm{P} \)
(3) 2
(4) 4


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