2Ag (s) + H2S(s) → Ag2S(s) + H2(g) Oxidation Half-Reaction:

Reduction Half-Reaction:

Oxidation half:

Reduction half:

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Oxidation half:

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

Reduction half:

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the correct answer is:

a. formation of precipitation