Which of the following metals does not give hydrogen with acids ?

Options

A. Iron
B. Copper
C. Aluminium
D. Magnesium

Explanation

To determine which metal does not produce hydrogen gas when reacting with acids, we can follow these steps:

### Step-by-Step Solution:

**Step 1: Understand the Reaction**
- When a metal reacts with an acid, it typically produces a metal salt and hydrogen gas. The general reaction can be represented as:
\[ \text{Metal} + \text{Acid} \rightarrow \text{Metal Salt} + \text{Hydrogen Gas} \]

**Step 2: Identify the Metals**
- The metals in question are Iron (Fe), Copper (Cu), Aluminium (Al), and Magnesium (Mg).

**Step 3: Analyze Each Metal's Reactivity**
- **Iron (Fe)**: Iron reacts with hydrochloric acid (HCl) to produce iron(III) chloride (FeCl3) and hydrogen gas. Therefore, iron does produce hydrogen gas.

- **Aluminium (Al)**: Aluminium also reacts with hydrochloric acid to produce aluminium chloride (AlCl3) and hydrogen gas. Thus, aluminium produces hydrogen gas as well.

- **Magnesium (Mg)**: Magnesium reacts with hydrochloric acid to form magnesium chloride (MgCl2) and hydrogen gas. Hence, magnesium also produces hydrogen gas.

- **Copper (Cu)**: Copper is less reactive than hydrogen. When copper is placed in hydrochloric acid, it does not react and therefore does not produce hydrogen gas.

**Step 4: Conclusion**
- Among the given metals, Copper is the only metal that does not give hydrogen gas when reacting with acids. Thus, the correct answer is Copper (Cu).

### Final Answer:
**Copper (Cu) does not give hydrogen with acids.**

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