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Consider the following reaction - VCE - SSCE Chemistry - Question 20 - 2012 - Paper 1
Question 20
Consider the following reaction. IO₃⁻(aq) + 5I⁻(aq) + 6H⁺(aq) → 3I₂(s) + 3H₂O(l) The correct half equation for the reduction reaction is A. 2I⁻(aq) → I₂(s) + 2e⁻ ... show full transcript
Worked Solution & Example Answer:Consider the following reaction - VCE - SSCE Chemistry - Question 20 - 2012 - Paper 1
Step 1
The correct half equation for the reduction reaction is
Answer
To identify the correct half equation, we need to determine how the iodate ion (IO₃⁻) is reduced in the overall reaction. The reduction process involves the IO₃⁻ reacting to produce I₂ as part of the reduction reaction.
Through inspection, we can analyze the options:
- A is a valid half-equation showing the reduction of iodide ions to iodine.
- B shows the reduction of protons to water, which does not pertain to IO₃⁻.
- C is incorrect as well, since it adds unnecessary species and does not balance correctly.
- D correctly represents the stoichiometry of iodate being reduced with the appropriate number of protons and electrons.
Thus, the correct choice that follows from the reduction reaction is:
D. 2IO₃⁻(aq) + 12H⁺(aq) + 10e⁻ → 6I₂(s) + 6H₂O(l)