Which of the following reactions takes place in soda-acid type fire extinguisher ?

Options

A. `CaCO_3overset(Delta)toCaO+CO_2`
B. `2NaHCO_3overset(Delta)toNa_2CO_3+H_2O+CO_2`
C. `2NaHCO_3+H_2SO_4toNa_2SO_4+2H_2O+2CO_2`
D. `CaCO_3+H_2SO_4toCaSO_4+H_2O+CO_2`

Answer

To determine which reaction takes place in a soda-acid type fire extinguisher, we need to analyze the components and the chemical reaction involved. Here’s a step-by-step solution:

### Step 1: Identify the Components
The soda-acid type fire extinguisher contains sodium bicarbonate (NaHCO3) and sulfuric acid (H2SO4).

**Hint:** Remember that sodium bicarbonate is commonly known as baking soda.

### Step 2: Understand the Reaction
When the fire extinguisher is activated, sulfuric acid is mixed with the sodium bicarbonate solution. This mixing initiates a chemical reaction.

**Hint:** Think about what happens when an acid reacts with a bicarbonate.

### Step 3: Write the Chemical Equation
The reaction between sodium bicarbonate and sulfuric acid can be represented by the following chemical equation:
\[ \text{NaHCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O} + \text{CO}_2 \]

**Hint:** Look for the products formed in the reaction, especially gases like CO2.

### Step 4: Analyze the Products
The products of the reaction include sodium sulfate (Na2SO4), water (H2O), and carbon dioxide (CO2). The carbon dioxide produced is a gas that is heavier than air and does not support combustion.

**Hint:** Consider how CO2 behaves in the context of fire and combustion.

### Step 5: Understand the Role of CO2
The carbon dioxide produced fills the area around the fire, displacing oxygen. Since oxygen is essential for combustion, the presence of CO2 effectively extinguishes the fire.

**Hint:** Remember that cutting off oxygen supply is crucial for extinguishing a fire.

### Conclusion
The reaction that takes place in a soda-acid type fire extinguisher is the reaction between sodium bicarbonate and sulfuric acid, resulting in the production of carbon dioxide, which helps to extinguish the fire.

**Final Answer:** The correct reaction is:
\[ \text{NaHCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O} + \text{CO}_2 \]