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Which of the following ions could be used to oxidise iodide ions to iodine? $2I^-(aq) \rightarrow I_2(g) + 2e^-$ A - Scottish Highers Chemistry - Question 19 - 2016
Question 19
Which of the following ions could be used to oxidise iodide ions to iodine? $2I^-(aq) \rightarrow I_2(g) + 2e^-$ A. $SO_2^{2-}(aq)$ B. $SO_3^{2-}(aq)$ C. $Cr^{... show full transcript
Worked Solution & Example Answer:Which of the following ions could be used to oxidise iodide ions to iodine? $2I^-(aq) \rightarrow I_2(g) + 2e^-$ A - Scottish Highers Chemistry - Question 19 - 2016
Step 1
Identify the Oxidizing Agent
Answer
To determine which ion can oxidise iodide ions () to iodine (), we need to evaluate the potential oxidizing agents among the options available. An oxidizing agent is a substance that gains electrons in a reaction and, in doing so, causes the oxidation of another species.
Step 2
Evaluate Each Option
Answer
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: Sulfite ions can act as reducing agents, which makes them unlikely to oxidise iodide.
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: Similar to sulfite, they can also behave as reducing agents and may not serve as oxidisers in this context.
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: Chromium ion in the +3 oxidation state is also more likely to act as a reducing agent, thus not suitable for oxidizing iodide.
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: The dichromate ion can act as a strong oxidizing agent, making it capable of oxidising iodide ions to iodine.