3
QuizMultiple Choice

Redox and Nuclear Chemistry — Test

Question 3 • Chemistry

This reaction was carried out in an acidic solution. cap i raised to the negative plus IO power sub 3 raised to the negative right arrow cap i sub 2 power Which statement is true about this equation?

Answer
A
Although it is unbalanced, it can be balanced by using the half-reaction method.
B
It has been balanced by using the half-reaction method.
C
It has been balanced by directly using spectator ions.
D
Although it is unbalanced, it can be balanced by directly using spectator ions.

Explanation

As written, the equation is unbalanced: it has two iodine atoms on the left but only two on the right, and the charges also do not match. In acidic solution, the half-reaction method adds H⁺ and H₂O to balance the redox reaction, giving 5 I⁻ + IO₃⁻ + 6 H⁺ → 3 I₂ + 3 H₂O. So the true statement is that the equation is unbalanced but can be balanced by the half-reaction method.

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