Which of the following metals cannot liberate hydrogen from dilute hydrochloric acid ?

Explanation

To determine which metal cannot liberate hydrogen from dilute hydrochloric acid (HCl), we need to refer to the electrochemical series. The electrochemical series ranks metals based on their ability to displace hydrogen ions from acids.

### Step-by-Step Solution:

1. **Understand the Electrochemical Series**: The electrochemical series lists metals in order of their reactivity. Metals that are above hydrogen in the series can displace hydrogen from acids, while those below hydrogen cannot.

2. **Identify the Metals**: We need to consider the specific metals mentioned in the question. For this example, let's assume the metals provided are: Copper (Cu), Zinc (Zn), and Iron (Fe).

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