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What are the half-reactions for these redox processes?

What are the half-reactions for these redox processes?

Aqueous hydrogen peroxide acts on Co2+, and the products are hydroxide ion and Co3+, in basic solution.
Balance the oxidation half-reaction.
Balance the reduction half-reaction.


Methane reacts with oxygen gas and produces water and carbon dioxide.
Balance the reduction half-reaction.
Balance the oxidation half-reaction.


To recharge a lead storage battery, lead(II) sulphate is converted to lead and to lead(IV) oxide.
Balance the reduction half-reaction.
Balance the oxidation half-reaction.


Zinc metal dissolves in aqueous hydrochloric acid to give Zn2+ ions and hydrogen gas.
Balance the reduction half-reaction.
Balance the oxidation half-reaction.

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