The correct among the following statements is/ae

Options

A. Calcium carbide on hydrolysis produces acetylene
B. Calcium carbide when heated with `N_(2)` at `1100^(@)C` forms calcium cyanamide
C. Cyanamide ion is isoelectronic with `CO_(2)`
D. Beryllium carbide on hydrolysis forms `CH_(4)`

Explanation

To solve the question regarding the correctness of the statements provided, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: Calcium carbide on hydrolysis produces acetylene.**
- **Chemical Reaction:**
\[ \text{CaC}_2 + 2 \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{C}_2\text{H}_2 \]
- **Analysis:** Calcium carbide (CaC2) reacts with water to produce calcium hydroxide (Ca(OH)2) and acetylene (C2H2).
- **Conclusion:** This statement is **correct**.

2. **Statement 2: Calcium carbide when heated with N2 at 1100°C forms calcium cyanamide.**
- **Chemical Reaction:**
\[ \text{CaC}_2 + \text{N}_2 \rightarrow \text{CaNCN} + \text{C} \]
- **Analysis:** Calcium carbide reacts with nitrogen at high temperatures to form calcium cyanamide (CaNCN) and carbon (C).
- **Conclusion:** This statement is **correct**.

3. **Statement 3: Cyanamide ion is isoelectronic with CO2.**
- **Analysis of CO2:**
- Carbon (C) has 6 electrons, and each oxygen (O) has 8 electrons.
- Total electrons in CO2 = 6 (C) + 8 (O) + 8 (O) = 22 electrons.
- **Analysis of Cyanamide Ion (N2C2H3^-):**
- The cyanamide ion can be represented as N≡C-NH2 or similar structures.
- Total electrons = 7 (N) + 6 (C) + 7 (N) + 2 (charge) = 22 electrons.
- **Conclusion:** This statement is **correct**.

4. **Statement 4: Beryllium carbide on hydrolysis forms CH4.**
- **Chemical Reaction:**
\[ \text{Be}_2\text{C} + 4 \text{H}_2\text{O} \rightarrow 2 \text{Be(OH)}_2 + \text{CH}_4 \]
- **Analysis:** Beryllium carbide reacts with water to produce beryllium hydroxide and methane (CH4).
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
All four statements are correct. Therefore, the answer is that **all statements (1, 2, 3, and 4) are correct**.

---