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Which of the following will react with Br<sub>2</sub>, but not with I<sub>2</sub>? A - Scottish Highers Chemistry - Question 20 - 2015
Question 20
Which of the following will react with Br<sub>2</sub>, but not with I<sub>2</sub>? A. OH<sup>-</sup> B. SO<sub>3</sub><sup>2-</sup> C. Fe<sup>2+</sup> D. Mn<sup>... show full transcript
Worked Solution & Example Answer:Which of the following will react with Br<sub>2</sub>, but not with I<sub>2</sub>? A - Scottish Highers Chemistry - Question 20 - 2015
Step 1
C. Fe<sup>2+</sup>
Answer
To determine which of the species reacts with Br<sub>2</sub> but not with I<sub>2</sub>, we start by considering the oxidation states and the properties of bromine and iodine.
Bromine (Br<sub>2</sub>) is a stronger oxidizing agent than iodine (I<sub>2</sub>). Hence, certain cations can preferentially react with bromine without undergoing a reaction with iodine.
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Analysis of Components:
- OH<sup>-</sup>: This is a reducing species, but it can react with both bromine and iodine, so it is not the answer.
- SO<sub>3</sub><sup>2-</sup>: Sulfite can also react with both halogens, hence not the answer.
- Fe<sup>2+</sup>: Iron in the +2 oxidation state can indeed react with Br<sub>2</sub> to form Fe<sup>3+</sup> while not readily reacting with I<sub>2</sub>, making this a strong candidate.
- Mn<sup>2+</sup>: Manganese also reacts with both halogens.
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Conclusion: Analyzing these findings, we conclude that only Fe<sup>2+</sup> aligns with the stated criteria, making it the correct answer.