Metal which does not react even with steam is

Options

A. potassium
B. iron
C. magnesium
D. silver.

Explanation

To determine which metal does not react even with steam, we can analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Metals**: The metals provided in the options are:
- A) Potassium (K)
- B) Iron (Fe)
- C) Magnesium (Mg)
- D) Silver (Ag)

2. **Analyze Potassium**:
- Potassium reacts vigorously with cold water and will also react with steam. The reaction with water can be represented as:
\[ 2K + 2H_2O \rightarrow 2KOH + H_2 \]
- Since potassium reacts with water, it will also react with steam. Thus, Potassium is not the answer.

3. **Analyze Iron**:
- Iron reacts with steam to form iron oxide and hydrogen gas. The reaction can be represented as:
\[ 3Fe + 4H_2O \rightarrow Fe_3O_4 + 4H_2 \]
- Since iron reacts with steam, it is not the answer.

4. **Analyze Magnesium**:
- Magnesium reacts with warm water and will also react with steam. The reaction can be represented as:
\[ Mg + H_2O \rightarrow Mg(OH)_2 + H_2 \]
- Since magnesium reacts with steam, it is not the answer.

5. **Analyze Silver**:
- Silver does not react with cold water, warm water, or steam. It is less reactive than hydrogen and does not participate in these reactions. Therefore, it does not react with steam.
- This is because silver is placed below hydrogen in the reactivity series.

6. **Conclusion**:
- The metal that does not react even with steam is **Silver (Ag)**.

### Final Answer:
The correct answer is **D) Silver**.

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