Dropping of water over calcium carbide produces ______gas.

Explanation

To solve the question "Dropping of water over calcium carbide produces ______ gas," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are calcium carbide (CaC₂) and water (H₂O).

2. **Write the Chemical Reaction**:
- When calcium carbide reacts with water, the reaction can be represented as:
\[ \text{CaC}_2 (s) + 2 \text{H}_2\text{O} (l) \rightarrow \text{Ca(OH)}_2 (aq) + \text{C}_2\text{H}_2 (g) \]
- Here, calcium carbide reacts with water to produce calcium hydroxide (Ca(OH)₂) in aqueous form and acetylene gas (C₂H₂).

3. **Identify the Product**:
- From the balanced equation, we can see that one of the products formed is acetylene gas (C₂H₂).

4. **Conclusion**:
- Therefore, when water is dropped over calcium carbide, the gas produced is acetylene.

### Final Answer:
Dropping of water over calcium carbide produces **acetylene gas**.