Hydrogen is a ———(reducing/oxidizing) agent.

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Solution

Hydrogen is a reducing agent
Hydrogen removes oxygen from metal oxides. this is called reduction and hydrogen is called a reducing agent
$stack Cu O open parentheses s close parentheses with Copper space oxide below space plus space H subscript 2 open parentheses g close parentheses space rightwards arrow stack Cu open parentheses s close parentheses with Copper below space plus space H subscript 2 O open parentheses l close parentheses$
Copper is left in the combustion tube
Thus, Hydrogen is a reducing agent.

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