Which metal is suitable to store acid in its vessel?

Options

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

Explanation

To determine which metal is suitable for storing acid in its vessel, we can follow these steps:

### Step 1: Understand the Reactivity Series
The reactivity series is a list that ranks metals based on their reactivity, from most reactive to least reactive. Metals that are more reactive can displace hydrogen from acids, while less reactive metals cannot.

### Step 2: Identify the Role of Hydrogen in Acids
Acids contain hydrogen ions (H⁺). When a metal reacts with an acid, it can displace hydrogen from the acid if it is more reactive than hydrogen.

### Step 3: Compare Metals with Hydrogen
To store an acid, we need a metal that is less reactive than hydrogen. This means we should look for metals that are positioned below hydrogen in the reactivity series.

### Step 4: Analyze Common Metals
- **Aluminum**: More reactive than hydrogen.
- **Zinc**: More reactive than hydrogen.
- **Iron**: More reactive than hydrogen.
- **Copper**: Less reactive than hydrogen.

### Step 5: Conclusion
Since copper is the only metal listed that is less reactive than hydrogen, it is suitable for storing acid. Therefore, the correct answer is copper.

### Final Answer
Copper is suitable to store acid in its vessel.

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