Question detail
What is the ionic equation for the reaction of fluorine with potassium bromide?
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. F2 + 2KBr -> 2Kf + Br2
- B. F2 + 2Br- -> 2F- + Br2
- C. 2F- + Br2 -> F2 + 2Br-
- D. F2 + 2K+ -> 2KF
Answer
F2 + 2Br- -> 2F- + Br2
Explanation
This ionic equation shows fluorine displacing bromide ions in potassium bromide, forming fluoride ions and bromine. This illustrates the strong oxidising ability of fluorine compared to bromine.
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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