A Guyanese gold mining operation uses a process that requires hydrogen to convert certain metal oxides to pure metals. Which term best describes the role of hydrogen in this reaction?

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Question

A Guyanese gold mining operation uses a process that requires hydrogen to convert certain metal oxides to pure metals. Which term best describes the role of hydrogen in this reaction?

Accepted Answer

Reducing agent — Award 1 mark for identifying hydrogen as a reducing agent. Hydrogen removes oxygen from metal oxides, thereby reducing the metal oxide to the metal. A is incorrect — an oxidising agent adds oxygen or removes electrons; hydrogen does the opposite. C is incorrect — a catalyst speeds up reactions without being consumed; hydrogen is consumed in this reaction. D is incorrect — a precipitating agent causes formation of an insoluble solid, which is not relevant here.

Answer

Oxidising agent

Answer

Reducing agent

Answer

Precipitating agent

Answer

Catalyst

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