Essential Chemistry for IGCSE - Chemical Reactions (Section 2 - No. 45)
Which of the following is true regarding the reaction between copper(II) oxide and hydrogen?
Copper(II) oxide is reduced, and hydrogen is the oxidizing agent.
Hydrogen is oxidized, and copper(II) oxide is the oxidizing agent.
Copper(II) oxide is reduced, and hydrogen is the reducing agent.
Hydrogen is reduced, and copper(II) oxide is the reducing agent.
Explanation
Copper(II) oxide loses oxygen and is reduced. Hydrogen gains oxygen and is oxidized. Hence, it is the reducing agent.
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