Which one of the following chemical reactions is represented by the equation: CI2+kBr ➔ KCl + Br2?
Correct answer: B. Redox
- A. Decomposition
- B. Redox
- C. Hydration
- D. Precipitation
Explanation
In a redox reaction, one substance is oxidized during the reaction (oxidation number increases) and another is reduced (oxidation number decreases. In this case, the oxidation state of Br in KBr is -1 and in Br2 is 0 so Br is oxidized. The oxidation state of Cl is 0 in Cl2 and -1 in KCl, so Cl is reduced. Therefore, this is a redox reaction and B is correct.
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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