What is ' \( \mathrm{A} \) ' in the following reaction \( 2 \mathrm{Fe}^{3+}(a q)+\mathrm{Sn}^{2...

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What is ' \( \mathrm{A} \) ' in the following reaction \( 2 \mathrm{Fe}^{3+}(a q)+\mathrm{Sn}^{2+}(a q) \rightarrow 2 \mathrm{Fe}^{2+}(a q)+\mathrm{A} \)
(a) \( \mathrm{Sn}^{3+}(a q) \)
(b) \( \mathrm{Sn}^{4+}(a q) \)
(c) \( \mathrm{Sn}^{2+}(a q) \)
(d) \( \mathrm{Sn} \)
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