From the following list of metals, choose the metal which fits into the given description.
Zinc, Sodium, Silver, Lead, Iron.
This metal reacts with both acids and hot concentrate alkalies to form hydrogen and a soluble salt.

Explanation

To solve the question, we need to identify which metal from the given list reacts with both acids and hot concentrated alkalis to produce hydrogen gas and a soluble salt. The metals provided are Zinc, Sodium, Silver, Lead, and Iron.

### Step-by-Step Solution:

1. **Understanding the Reaction with Acids:**
- Metals that react with acids typically produce hydrogen gas and a soluble salt.
- For example, when zinc (Zn) reacts with hydrochloric acid (HCl), it produces zinc chloride (ZnCl2) and hydrogen gas (H2).

...