Which product of the following reaction is used to treat acid indigestion ?

Options

A. `Al_(4)C_(3) + H_(2)O rarr CH -= CH + Al(OH)_(3)`
B. `CaC_(2) + H_(2)O rarr CH -= CH + Ca(OH)_(2)`
C. `Mg_(4)C_(3) + H_(2)O rarr CH_(3)C -= CH + Mg(OH)_(2)`
D. All true

Answer

To determine which product of the given reactions is used to treat acid indigestion, we can analyze each reaction step by step.

### Step 1: Analyze the Reactions
We have three reactions provided:

1. **Aluminum carbide reaction**:
\[ \text{Al}_4\text{C}_3 + \text{H}_2\text{O} \rightarrow \text{CH} \equiv \text{CH} + \text{Al(OH)}_3 \]

2. **Calcium carbide reaction**:
\[ \text{CaC}_2 + \text{H}_2\text{O} \rightarrow \text{CH} \equiv \text{CH} + \text{Ca(OH)}_2 \]

3. **Magnesium carbide reaction**:
\[ \text{Mg}_4\text{C}_3 + \text{H}_2\text{O} \rightarrow \text{CH}_3\text{C} \equiv \text{CH} + \text{Mg(OH)}_2 \]

### Step 2: Identify the Products
Next, we identify the products of each reaction that could potentially be used to treat acid indigestion:

- From the **first reaction**, the product is **Al(OH)₃ (Aluminum hydroxide)**.
- From the **second reaction**, the product is **Ca(OH)₂ (Calcium hydroxide)**.
- From the **third reaction**, the product is **Mg(OH)₂ (Magnesium hydroxide)**.

### Step 3: Understand Antacids
Antacids are substances that neutralize stomach acidity. Common antacids include:

- Aluminum hydroxide (Al(OH)₃)
- Calcium hydroxide (Ca(OH)₂)
- Magnesium hydroxide (Mg(OH)₂)

### Step 4: Conclusion
Since all three products (Al(OH)₃, Ca(OH)₂, and Mg(OH)₂) are hydroxides and can act as antacids, they are all capable of treating acid indigestion.

Thus, the answer is that **all three reactions produce products that can be used to treat acid indigestion**.

### Final Answer:
**All true (Option 4)**.

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