Which of the following gives `PH_3` on treatment with water ?

Options

A. `Ca_3P_2`
B. `Na_3P`
C. AlP
D. All of the above

Answer

To determine which of the given compounds produces phosphine (PH₃) when treated with water, we will analyze each compound one by one.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are Ca₃P₂ (Calcium Phosphide), Na₃P (Sodium Phosphide), and AlP (Aluminum Phosphide).

2. **Reaction of Ca₃P₂ with Water**:
- When Calcium Phosphide reacts with water, the reaction can be represented as:
\[ \text{Ca}_3\text{P}_2 + 6 \text{H}_2\text{O} \rightarrow 3 \text{Ca(OH)}_2 + 2 \text{PH}_3 \]
- This reaction produces phosphine (PH₃) along with calcium hydroxide.

3. **Reaction of Na₃P with Water**:
- When Sodium Phosphide reacts with water, the reaction can be represented as:
\[ \text{Na}_3\text{P} + 3 \text{H}_2\text{O} \rightarrow 3 \text{NaOH} + \text{PH}_3 \]
- This reaction also produces phosphine (PH₃) along with sodium hydroxide.

4. **Reaction of AlP with Water**:
- When Aluminum Phosphide reacts with water, the reaction can be represented as:
\[ \text{AlP} + 3 \text{H}_2\text{O} \rightarrow \text{Al(OH)}_3 + \text{PH}_3 \]
- This reaction similarly produces phosphine (PH₃) along with aluminum hydroxide.

5. **Conclusion**:
- All three compounds (Ca₃P₂, Na₃P, and AlP) produce phosphine (PH₃) when treated with water. Therefore, the answer is that **all of the above compounds give PH₃ on treatment with water**.

### Final Answer:
**All of the above (Ca₃P₂, Na₃P, AlP) give PH₃ on treatment with water.**

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