Question

For basic solutions, which element is added to balance half-reactions?

chlorine
hydroxide
iron
nitrogen

Answer 1

Upon addition to water, chlorine forms hypochlorous acid which can neutralize basic solutions.

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Answer 2

Answer: Hydroxide ion

Explanation: The question is to balance half -reactions in basic solutions(medium) and not to neutralize the basic solutions.

In acidic medium, half-reactions are balanced by adding $H^+$ and $H_2O$ where as the half-reactions in basic medium are balanced by adding $OH^-$ and $H_2O$ .

As the question asks about balancing  half-reactions in basic solutions, the right choice is hydroxide ion.

Chlorine, Iron or nitrogen are not used for balancing half reactions.