Which of the following does not produce any gaseous product when reacts with water?

Options

A. `Ca_(3)N_(2)`
B. `CaC_(2)`
C. `CaO`
D. `Ca_(3)P_(2)`

Explanation

To solve the question of which compound does not produce any gaseous product when reacting with water, we will analyze the reactions of the given compounds with water step by step.

### Step 1: Identify the Compounds
We have the following compounds to consider:
1. Calcium nitride (Ca3N2)
2. Calcium carbide (CaC2)
3. Calcium oxide (CaO)
4. Calcium phosphide (Ca3P2)

### Step 2: Analyze Each Compound's Reaction with Water

**1. Calcium Nitride (Ca3N2)**
- Reaction:
\[ \text{Ca}_3\text{N}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Ca(OH)}_2 + 2\text{NH}_3 \]
- Products: Calcium hydroxide (Ca(OH)2) and ammonia (NH3).
- Ammonia is a gas, so this compound produces a gaseous product.

**2. Calcium Carbide (CaC2)**
- Reaction:
\[ \text{CaC}_2 + 2\text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{C}_2\text{H}_2 \]
- Products: Calcium hydroxide (Ca(OH)2) and acetylene (C2H2).
- Acetylene is a gas, so this compound also produces a gaseous product.

**3. Calcium Oxide (CaO)**
- Reaction:
\[ \text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 \]
- Products: Calcium hydroxide (Ca(OH)2).
- No gaseous product is formed in this reaction.

**4. Calcium Phosphide (Ca3P2)**
- Reaction:
\[ \text{Ca}_3\text{P}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Ca(OH)}_2 + 2\text{PH}_3 \]
- Products: Calcium hydroxide (Ca(OH)2) and phosphine (PH3).
- Phosphine is a gas, so this compound produces a gaseous product.

### Step 3: Conclusion
From the analysis, we find that:
- Calcium nitride (Ca3N2) produces ammonia (NH3) – gas.
- Calcium carbide (CaC2) produces acetylene (C2H2) – gas.
- Calcium oxide (CaO) produces no gaseous product.
- Calcium phosphide (Ca3P2) produces phosphine (PH3) – gas.

Thus, the compound that does not produce any gaseous product when reacting with water is **Calcium Oxide (CaO)**.

### Final Answer
**Calcium Oxide (CaO)** does not produce any gaseous product when it reacts with water.