______ is not used in the preparation of hydrogen because it is a strong oxidizing agent.

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Solution

Oxidizing agent: It is a type of substance that itself gets reduced and oxidizes the other substance.
The hydrogen gas produced during dilute nitric acid (HNO₃) reaction with metal gets oxidized because of the strong oxidizing nature of nitric acid and hydrogen gas gets converted into water.
Therefore no hydrogen production because nitric acid is a strong oxidizing agent.
For example: $2 Zn (s) + 8 {HNO}_{3} (l) \to 3 Zn {({NO}_{3})}_{2} (s) + 4 H_{2} O (l) + 2 NO (g)$

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