Problem 5 vs 13

[Amy Zheng 2l]

In problem 5a, the oxidation reaction is: Br-->BrO3-
In problem 13a, the oxidation reaction is: H2->H+

How come for number 13, it's not h2->HCl but in 5 its br->BrO3-

[Abdullah2I]

i have the same question

[Andy Liao 1B]

Cl- is a spectator ion, whereas O2- is not. A spectator ion exists in the same form on both the reactant and product sides of a chemical equation, so when writing a net ionic equation, spectator ions found in the original equation are ignored.