Answer:
Although it is unbalanced, it can be balanced by using the half-reaction method
Explanation:
Skeleton half-reaction: IO₃⁻ ⟶ I₂
Balance atoms other than O and H: 2IO₃⁻ ⟶ I₂
Balance O: 2IO₃⁻ ⟶ I₂ + 6H₂O
Balance H: 2IO₃⁻ + 12 H⁺ ⟶ I₂ + 6H₂O
Balance charge: 2IO₃⁻ + 12 H⁺ + 10e⁻ ⟶ I₂ + 6H₂O
A and C are wrong. The original equation is not balanced. It has 3 O on he left and none on the right.
D is wrong. You can't balance any equation by using spectator ions.
A. Although it is unbalanced, it can be balanced by using the half-reaction method.
The half-reaction approach is a manner to balance redox reactions. It involves breaking the general equation down into an oxidation element and a discount component. ChemistryStoichiometry of Oxidation-discount Reactions.
example: Zn and Cu Galvanic cell
at the Zn anode, oxidation takes place (the metal loses electrons). that is represented within the following oxidation 1/2 reaction (note that the electrons are on the product's aspect): Zn(s) → Zn2+ + 2e. at the Cu cathode, reduction takes place (electrons are accepted)
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