Phosphine, acetylene and ammonia can be formed by treating water with

Options

A. `Mg_3 P_2, Al_4 Cl_3, Li_3 N`
B. `Ca_3 P_2, CaC_2, Mg_3 N_2`
C. `Ca_3 P_2, CaC_2, CaCN_2`
D. `Ca_3 P_2, Mg_2 C, NH_4 NO_3`

Explanation

To solve the question of how phosphine (PH₃), acetylene (C₂H₂), and ammonia (NH₃) can be formed by treating water with certain compounds, we can analyze the reactions step by step.

### Step 1: Identify the Compounds
We need to find which compounds can react with water to produce phosphine, acetylene, and ammonia. The compounds we are considering are calcium phosphide (Ca₃P₂), calcium carbide (CaC₂), and magnesium nitride (Mg₃N₂).

### Step 2: Formation of Phosphine
Phosphine (PH₃) can be formed from calcium phosphide (Ca₃P₂) when it reacts with water. The reaction can be written as:
\[ \text{Ca}_3\text{P}_2 + 6 \text{H}_2\text{O} \rightarrow 3 \text{Ca(OH)}_2 + 2 \text{PH}_3 \]

Here, calcium hydroxide (Ca(OH)₂) is also produced along with phosphine.

### Step 3: Formation of Acetylene
Acetylene (C₂H₂) can be formed from calcium carbide (CaC₂) when it reacts with water. The reaction is:
\[ \text{CaC}_2 + 2 \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{C}_2\text{H}_2 \]

Again, calcium hydroxide is produced along with acetylene.

### Step 4: Formation of Ammonia
Ammonia (NH₃) can be formed from magnesium nitride (Mg₃N₂) when it reacts with water. The reaction is:
\[ \text{Mg}_3\text{N}_2 + 6 \text{H}_2\text{O} \rightarrow 3 \text{Mg(OH)}_2 + 2 \text{NH}_3 \]

Here, magnesium hydroxide (Mg(OH)₂) is produced along with ammonia.

### Step 5: Conclusion
From the above reactions, we can conclude that treating water with the combination of calcium phosphide (Ca₃P₂), calcium carbide (CaC₂), and magnesium nitride (Mg₃N₂) will yield phosphine, acetylene, and ammonia. Therefore, the correct answer is option 2.

### Summary of Reactions:
1. **Phosphine Formation**:
\[ \text{Ca}_3\text{P}_2 + 6 \text{H}_2\text{O} \rightarrow 3 \text{Ca(OH)}_2 + 2 \text{PH}_3 \]
2. **Acetylene Formation**:
\[ \text{CaC}_2 + 2 \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{C}_2\text{H}_2 \]
3. **Ammonia Formation**:
\[ \text{Mg}_3\text{N}_2 + 6 \text{H}_2\text{O} \rightarrow 3 \text{Mg(OH)}_2 + 2 \text{NH}_3 \]