Which of the following metal does not produce dihydrogen gas with dilute hydrochloric acid?

Options

A. `Mg`
B. `Zn`
C. `Ag`
D. `Ba`

Answer

To determine which metal does not produce dihydrogen gas when reacting with dilute hydrochloric acid, we need to analyze the reactivity of the metals in question. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Reaction
Metals react with dilute hydrochloric acid (HCl) to produce dihydrogen gas (H₂) and a metal chloride. The general reaction can be represented as:
\[ \text{Metal} + \text{HCl} \rightarrow \text{Metal Chloride} + \text{H}_2 \uparrow \]

### Step 2: Refer to the Reactivity Series
The reactivity series of metals helps us predict whether a metal can displace hydrogen from acids. Metals that are more reactive than hydrogen can displace hydrogen and produce dihydrogen gas.

### Step 3: Identify the Metals
Let’s consider the metals mentioned in the question. For the sake of this solution, we will assume the metals are:
- A) Magnesium (Mg)
- B) Zinc (Zn)
- C) Silver (Ag)
- D) Barium (Ba)

### Step 4: Analyze Each Metal
- **Magnesium (Mg)**: More reactive than hydrogen, will produce dihydrogen gas.
- **Zinc (Zn)**: Also more reactive than hydrogen, will produce dihydrogen gas.
- **Silver (Ag)**: Less reactive than hydrogen, will NOT produce dihydrogen gas.
- **Barium (Ba)**: More reactive than hydrogen, will produce dihydrogen gas.

### Step 5: Conclusion
From the analysis, we can conclude that **Silver (Ag)** is the metal that does not produce dihydrogen gas with dilute hydrochloric acid. Therefore, the answer is **option C (Silver)**.