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The standard reduction potentials of the following electrodes are given below. Answer the questions…
The standard reduction potentials of the following electrodes are given below. Answer the questions that follow:
| Electrodes | SRP values |
|---|---|
| $\text{Fe}^{2+}/\text{Fe}$ | -0.44V |
| $\text{Mg}^{2+}/\text{Mg}$ | -2.37V |
| $\text{I}_2/2\text{I}^-$ | +0.54V |
| $\text{Ag}^+/\text{Ag}$ | +0.88V |
(a)
Which substance/s could be used to convert iodide ions to iodine?
(b)
From the given reactions which reaction is spontaneous and why?
I: $\text{Fe}^{2+} + 2\text{Ag} \rightarrow 2\text{Ag}^{+1} + \text{Fe}$
II: $\text{Fe}^{2+} + \text{Mg} \rightarrow \text{Mg}^{2+} + \text{Fe}$
Answer
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From ISC 2025 Practice Chemistry, question 51.