Question detail
Which of the following is the correct ionic equation for the reaction of chlorine with sodium iodide?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 7(17), the halogens
Question
- A. Cl2 + 2NaI -> 2NaCl + I2
- B. Cl2 + 2I- -> 2Cl- + I2
- C. 2Cl- + I2 -> Cl2 + 2I-
- D. Cl2 + 2Na+ -> 2NaCl
Answer
Cl2 + 2I- -> 2Cl- + I2
Explanation
This ionic equation represents chlorine displacing iodide ions from sodium iodide, resulting in the formation of chloride ions and iodine. This is consistent with the trend in oxidising ability of halogens.
Common mistake
Common Mistake in Writing Ionic Equations
Students often forget to balance the charges in ionic equations for halogen displacement reactions.
To write a correct ionic equation, ensure that the total charge on both sides is equal. For example, when writing the equation for the displacement of bromine by chlorine, start with Cl2 + 2Br- → 2Cl- + Br2. Check that the charges balance: 0 on the left and -2 on the right, which is incorrect. Adjust to ensure both sides have the same total charge.
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