Reaction of marble with atmospheric humidity and `CO_(2)` to form slaked lime is an example for .

Options

A. decomposition rection
B. displacement reaction
C. combinaiton reaction
D. redox reaction

Explanation

To solve the question regarding the reaction of marble with atmospheric humidity and CO₂ to form slaked lime, we need to analyze the nature of the reaction taking place. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Reactants
The reactants in this reaction are:
- Marble (primarily composed of calcium carbonate, CaCO₃)
- Atmospheric humidity (water, H₂O)
- Carbon dioxide (CO₂)

### Step 2: Write the Reaction
When marble reacts with atmospheric humidity and carbon dioxide, it produces slaked lime, which is calcium hydroxide (Ca(OH)₂). The overall reaction can be represented as:
\[ \text{CaCO}_3 + \text{H}_2\text{O} + \text{CO}_2 \rightarrow \text{Ca(OH)}_2 \]

### Step 3: Determine the Type of Reaction
To classify the reaction, we need to understand the definitions of the different types of reactions:
1. **Decomposition Reaction**: A single compound breaks down into two or more simpler substances.
2. **Displacement Reaction**: An element displaces another in a compound.
3. **Combination Reaction**: Two or more substances combine to form a single product.
4. **Redox Reaction**: Involves the transfer of electrons, where oxidation and reduction occur simultaneously.

### Step 4: Analyze the Reaction
In this case, we have multiple reactants (CaCO₃, H₂O, and CO₂) combining to form a single product (Ca(OH)₂). This fits the definition of a combination reaction, where two or more reactants combine to form one product.

### Step 5: Conclusion
Based on the analysis, the reaction of marble with atmospheric humidity and CO₂ to form slaked lime is classified as a **combination reaction**.

### Final Answer
The reaction of marble with atmospheric humidity and CO₂ to form slaked lime is an example of a **combination reaction**.

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