From among the set of metals-sodium, zinc, iron, copper and silver, select the following giving equation for reaction.
One metal which is used to prepare hydrogen gas in the laboratory.

Explanation

To solve the question, we need to identify which metal from the given set can be used to prepare hydrogen gas in the laboratory and provide the corresponding chemical equation for the reaction.

### Step-by-Step Solution:

1. **Identify the Metals**: The metals provided are Sodium, Zinc, Iron, Copper, and Silver.

2. **Understand the Reaction**: To prepare hydrogen gas in the laboratory, we typically react a metal with an acid. The metals that can displace hydrogen from acids are those that are more reactive than hydrogen in the reactivity series.

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